IntelliJ 2020.2 IDEA 64-bit won't start but 32-bit starts on Windows 10 64-bit operating system

I updated IntelliJ IDEA latest version but it can not startup

Any ideas? 

Does it work via idea.bat? What happens if you start idea64.exe?

Does it help if you install https://aka.ms/vs/16/release/vc_redist.x64.exe ?

the stacktrace is via idea.bat. 

I installed https://aka.ms/vs/16/release/vc_redist.x64.exe but it still continues w/o working  

Delete the plug-ins directory (https://intellij-support.jetbrains.com/hc/articles/206544519). The issue caused by the third-party plug-in. See also https://intellij-support.jetbrains.com/hc/en-us/articles/360007568559.

which third-party plug-in ? 

Possibly Vaadin, but can't tell more without the complete logs.

I uninstall Vaddin but it doesn't still work 

this is the complete log via .bat

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
MavenPluginConfig.readExternal:81 - MavenPluginConfig: maven.bat; $artifactId-$version; copy files; 50; 50
Aug 21, 2020 5:56:58 PM com.vaadin.designer2.browser.EmbeddedJxBrowser initializeBrowserCore
INFO: BrowserCore initialized.
2020-08-21 17:56:59,225 [ 7259] ERROR - ect.impl.ProjectFrameAllocator - Expected current state is DISPOSE_IN_PROGRESS, but actual state is ACTIVE (Project(name=null, containerState=ACTIVE, componentStore=<not initialize
java.lang.IllegalStateException: Expected current state is DISPOSE_IN_PROGRESS, but actual state is ACTIVE (Project(name=null, containerState=ACTIVE, componentStore=<not initialized>))
at com.intellij.serviceContainer.ComponentManagerImpl.dispose(ComponentManagerImpl.kt:874)
at com.intellij.openapi.project.impl.ProjectExImpl.dispose(ProjectExImpl.kt:171)
at com.intellij.openapi.util.ObjectTree.executeActionWithRecursiveGuard(ObjectTree.java:189)
at com.intellij.openapi.util.ObjectTree.executeUnregistered(ObjectTree.java:202)
at com.intellij.openapi.util.ObjectTree.executeAll(ObjectTree.java:131)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:121)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:111)
at com.intellij.openapi.project.impl.ProjectManagerImpl.lambda$initProject$0(ProjectManagerImpl.java:182)
at com.intellij.openapi.application.WriteAction.lambda$runAndWait$1(WriteAction.java:133)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:968)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:994)
at com.intellij.openapi.application.WriteAction.compute(WriteAction.java:114)
at com.intellij.openapi.application.WriteAction.lambda$computeAndWait$2(WriteAction.java:163)
at com.intellij.openapi.application.WriteThread.lambda$submit$0(WriteThread.java:27)
at com.intellij.openapi.application.WriteThread.lambda$submit$1(WriteThread.java:44)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:201)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLaterOnWriteThread$11(ApplicationImpl.java:791)
at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:132)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:188)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:967)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:450)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:733)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:449)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:497)
at com.intellij.ide.IdeEventQueue.pumpEventsForHierarchy(IdeEventQueue.java:1023)
at com.intellij.openapi.progress.util.ProgressWindow.pumpEventsForHierarchy(ProgressWindow.java:225)
at com.intellij.openapi.progress.util.ProgressWindow.lambda$startBlocking$4(ProgressWindow.java:214)
at com.intellij.openapi.application.impl.ApplicationImpl.runUnlockingIntendedWrite(ApplicationImpl.java:828)
at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:213)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$legacyExec$6(ProgressRunner.java:304)
at java.base/java.util.concurrent.CompletableFuture.uniAcceptNow(CompletableFuture.java:753)
at java.base/java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:731)
at java.base/java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2108)
at com.intellij.openapi.progress.impl.ProgressRunner.legacyExec(ProgressRunner.java:302)
at com.intellij.openapi.progress.impl.ProgressRunner.submit(ProgressRunner.java:250)
at com.intellij.openapi.progress.impl.ProgressRunner.submitAndGet(ProgressRunner.java:171)
at com.intellij.openapi.application.impl.ApplicationImpl.runProcessWithProgressSynchronously(ApplicationImpl.java:421)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:502)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:83)
at com.intellij.openapi.project.impl.ProjectUiFrameAllocator$run$1.run(ProjectFrameAllocator.kt:100)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:201)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeAndWait$8(ApplicationImpl.java:475)
at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:126)
at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:132)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:188)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:967)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:450)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:744)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:449)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:497)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Suppressed: java.lang.RuntimeException
at com.intellij.openapi.application.WriteAction.computeAndWait(WriteAction.java:172)
at com.intellij.openapi.application.WriteAction.runAndWait(WriteAction.java:132)
at com.intellij.openapi.project.impl.ProjectManagerImpl.initProject(ProjectManagerImpl.java:182)
at com.intellij.openapi.project.impl.ProjectManagerExImpl.prepareProject(ProjectManagerExImpl.kt:221)
at com.intellij.openapi.project.impl.ProjectManagerExImpl.access$prepareProject(ProjectManagerExImpl.kt:47)
at com.intellij.openapi.project.impl.ProjectManagerExImpl$openProject$$inlined$runInAutoSaveDisabledMode$lambda$1.invoke(ProjectManagerExImpl.kt:102)
at com.intellij.openapi.project.impl.ProjectManagerExImpl$openProject$$inlined$runInAutoSaveDisabledMode$lambda$1.invoke(ProjectManagerExImpl.kt:47)
at com.intellij.openapi.project.impl.ProjectUiFrameAllocator$run$1$progressTask$1.run(ProjectFrameAllocator.kt:84)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:935)
at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:490)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$new$0(ProgressRunner.java:79)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:235)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:170)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:629)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:581)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:157)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:235)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
at java.base/java.lang.Thread.run(Thread.java:834)
2020-08-21 17:56:59,245 [ 7279] ERROR - ect.impl.ProjectFrameAllocator - IntelliJ IDEA 2020.2 Build #IU-202.6397.94
2020-08-21 17:56:59,246 [ 7280] ERROR - ect.impl.ProjectFrameAllocator - JDK: 11.0.7; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2020-08-21 17:56:59,246 [ 7280] ERROR - ect.impl.ProjectFrameAllocator - OS: Windows 10
2020-08-21 17:56:59,247 [ 7281] ERROR - ect.impl.ProjectFrameAllocator - Last Action:
2020-08-21 17:56:59,541 [ 7575] ERROR - ect.impl.ProjectFrameAllocator - Expected current state is DISPOSE_IN_PROGRESS, but actual state is ACTIVE (Project(name=null, containerState=ACTIVE, componentStore=<not initialize
java.lang.IllegalStateException: Expected current state is DISPOSE_IN_PROGRESS, but actual state is ACTIVE (Project(name=null, containerState=ACTIVE, componentStore=<not initialized>))
at com.intellij.serviceContainer.ComponentManagerImpl.dispose(ComponentManagerImpl.kt:874)
at com.intellij.openapi.project.impl.ProjectExImpl.dispose(ProjectExImpl.kt:171)
at com.intellij.openapi.util.ObjectTree.executeActionWithRecursiveGuard(ObjectTree.java:189)
at com.intellij.openapi.util.ObjectTree.executeUnregistered(ObjectTree.java:202)
at com.intellij.openapi.util.ObjectTree.executeAll(ObjectTree.java:131)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:121)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:111)
at com.intellij.openapi.project.impl.ProjectManagerImpl.lambda$initProject$0(ProjectManagerImpl.java:182)
at com.intellij.openapi.application.WriteAction.lambda$runAndWait$1(WriteAction.java:133)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:968)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:994)
at com.intellij.openapi.application.WriteAction.compute(WriteAction.java:114)
at com.intellij.openapi.application.WriteAction.lambda$computeAndWait$2(WriteAction.java:163)
at com.intellij.openapi.application.WriteThread.lambda$submit$0(WriteThread.java:27)
at com.intellij.openapi.application.WriteThread.lambda$submit$1(WriteThread.java:44)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:201)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLaterOnWriteThread$11(ApplicationImpl.java:791)
at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:132)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:188)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:967)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:450)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:733)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:449)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:497)
at com.intellij.ide.IdeEventQueue.pumpEventsForHierarchy(IdeEventQueue.java:1023)
at com.intellij.openapi.progress.util.ProgressWindow.pumpEventsForHierarchy(ProgressWindow.java:225)
at com.intellij.openapi.progress.util.ProgressWindow.lambda$startBlocking$4(ProgressWindow.java:214)
at com.intellij.openapi.application.impl.ApplicationImpl.runUnlockingIntendedWrite(ApplicationImpl.java:828)
at com.intellij.openapi.progress.util.ProgressWindow.startBlocking(ProgressWindow.java:213)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$legacyExec$6(ProgressRunner.java:304)
at java.base/java.util.concurrent.CompletableFuture.uniAcceptNow(CompletableFuture.java:753)
at java.base/java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:731)
at java.base/java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2108)
at com.intellij.openapi.progress.impl.ProgressRunner.legacyExec(ProgressRunner.java:302)
at com.intellij.openapi.progress.impl.ProgressRunner.submit(ProgressRunner.java:250)
at com.intellij.openapi.progress.impl.ProgressRunner.submitAndGet(ProgressRunner.java:171)
at com.intellij.openapi.application.impl.ApplicationImpl.runProcessWithProgressSynchronously(ApplicationImpl.java:421)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcessWithProgressSynchronously(CoreProgressManager.java:502)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcessWithProgressSynchronously(ProgressManagerImpl.java:83)
at com.intellij.openapi.project.impl.ProjectUiFrameAllocator$run$1.run(ProjectFrameAllocator.kt:100)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:201)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeAndWait$8(ApplicationImpl.java:475)
at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:126)
at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:132)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:188)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:967)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:450)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:744)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:449)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:497)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Suppressed: java.lang.RuntimeException
at com.intellij.openapi.application.WriteAction.computeAndWait(WriteAction.java:172)
at com.intellij.openapi.application.WriteAction.runAndWait(WriteAction.java:132)
at com.intellij.openapi.project.impl.ProjectManagerImpl.initProject(ProjectManagerImpl.java:182)
at com.intellij.openapi.project.impl.ProjectManagerExImpl.prepareProject(ProjectManagerExImpl.kt:221)
at com.intellij.openapi.project.impl.ProjectManagerExImpl.access$prepareProject(ProjectManagerExImpl.kt:47)
at com.intellij.openapi.project.impl.ProjectManagerExImpl$openProject$$inlined$runInAutoSaveDisabledMode$lambda$1.invoke(ProjectManagerExImpl.kt:102)
at com.intellij.openapi.project.impl.ProjectManagerExImpl$openProject$$inlined$runInAutoSaveDisabledMode$lambda$1.invoke(ProjectManagerExImpl.kt:47)
at com.intellij.openapi.project.impl.ProjectUiFrameAllocator$run$1$progressTask$1.run(ProjectFrameAllocator.kt:84)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:935)
at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:490)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$new$0(ProgressRunner.java:79)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:235)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:170)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:629)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:581)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:157)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:235)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
at java.base/java.lang.Thread.run(Thread.java:834)
2020-08-21 17:56:59,582 [ 7616] ERROR - ect.impl.ProjectFrameAllocator - IntelliJ IDEA 2020.2 Build #IU-202.6397.94
2020-08-21 17:56:59,583 [ 7617] ERROR - ect.impl.ProjectFrameAllocator - JDK: 11.0.7; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o.
2020-08-21 17:56:59,583 [ 7617] ERROR - ect.impl.ProjectFrameAllocator - OS: Windows 10
2020-08-21 17:56:59,584 [ 7618] ERROR - ect.impl.ProjectFrameAllocator - Last Action:

This log shows that Vaadin plug-in is still installed.

Try the clean install per https://intellij-support.jetbrains.com/hc/en-us/articles/360007568559.