How to import old settings to intelijidea?

Question

IntelliJ IDEA

Ubuntu 16 system - stb.
There was a full version of the idea, there was a license, now there is no litsuhi reinstalled it, pulled out the old settings both (system and configs), but I can’t import them because it requires a key! QUESTION - What folders or files need to be removed from the old settings in order for the idea to import settings without requiring a key? or skinte a link with a guide.
Thanks a lot!