I downloaded IntelliJ 15 CE to Mac OS X 10.11.1 and opened the .dmg file. I was able to run IntelliJ ok from the corresponding drive. Then I copied IntelliJ from the drive to the /Applications directory. On opening it, I get a pop-up saying:
"Intellij IDEA 15 CE" is damaged and can't be opened. You should move it to the Trash."
I've tried re-signing it with a personal certificate, but this doesn't make any difference.
Any suggestions for how to install this release? I haven't seen anything like this with earlier releases.
Please note that the "thanks for downloading" page https://www.jetbrains.com/idea/download/download_thanks.jsp contains a broken link to "Installation and licensing" (https://www.jetbrains.com/idea/help/basics-and-installation.html).