Marketplace Plugins are not loaded

I have the same issue on my new licensed version PyCharm 2020.3. I tried the fixes above but nothing works or looks relevant for me. I also have installed in my company's computer PyCharm 2023 (Community Edition) which actually works fine and manages to get to the Marketplace Plugins.
I uploaded my .log file: 

Upload id: 2024_07_23_b9nighFLQLgk4Gj3VoyfA3 (file: Riccardo_intellij-plugins.log)

Hi Riccardo DELLA VECCHIA 

Are you able to download the plugins from our server in the browser? E.g. by executing the following URL: https://plugins.jetbrains.com/pluginManager/?build=PY-203.5981.165&id=org.kdb.studio&uuid=603656cc-a51c-481f-8055-c0b4bdc85a4f

If you have a proxy server in your network, you might need to configure it in the IDE.

Also, make sure that the IDE process (idea64.exe) is allowed outgoing connections, and that https://plugins.jetbrains.com endpoint is whitelisted.

The most recent exception in the log hints at the issue with SSL certificates. As a workaround, see if it helps to delete the file called cacerts from the IDE configuration directory. Example: C:\Users\username\AppData\Roaming\JetBrains\PyCharm2020.3\ssl\cacerts

After doing that and restarting PyCharm, you will receive prompts for your untrusted corporate certificates which you can explicitly accept to resolve the connection issue.

Dear Arina,

thank you for the last suggestion. I think it is working because I see some plugins now that start appearing in the background as you can see from the screenshot. Anyway this “Untrustet Server's Certificate” keeps on appearing on my screen preventing me to go on even after I accept again and again. Do you know what is the issue here?

Best,

Riccardo

Your organization is using HTTPS proxy with self-signed certificates. Our most recent IDE versions can use your system certificates automatically. One option would be to update to the most recent PyCharm version at https://www.jetbrains.com/pycharm/download/index.html . 

If it's not possible, you will need to install the root CA for the self-signed certificate into the JetBrains Runtime used to run PyCharm as described here. It's a bit complicated, and you may need to ask someone from your IT helpdesk / network administration / security teams for help.