I have experienced problems since moving to the latest version of one of the IDEA plugins I use. I can download ZIP files of previous versions of the plugin from their website b
If you are on Mac, it would be:
~/Library/Application Support/IntelliJIdeaXXwhere XX is IDEA version number code.
You can find more details for different platforms in the FAQ.
Think you can simple drop the jar in the plugins directory:
idea.plugins.path=${user.home}/.IntelliJIdea80/config/plugins
On Windows:
idea.plugins.path=%USERPROFILE%\.IntelliJIdea80\config\plugins
You could also download the zip and then in Settings Plugins press install plugin from disk and choose the zipfile. Works like a charm on my Mac =)