It seems that linux instalation archive is corrupt. When extracting it i get errors. Even after I managed to extract it, I now get "It seems that you have corrupted stubs in your RubyMine or Ruby plugin installation. Please reinstall!". I tried reinstalling several times, but it's always same.
Also I'm not sure if this is related I can't seem to find an option to run single spec file (or single spec), even though I added rspec and rspec-rails gem dependencies. The 'it' method is underlined, which is strange because 'describe' isn't.