Thank you, yes thank you! Now it's connected. Let's see if it actully works.
If anyone else is struggling with the same issue this is what I did: installed 1.3.7 gui as PeteNelis suggested. After that I manually tried to install drivers https://flirc.zendesk.com/hc/en-us/articles/200984473. With 1.3.6 I couldn't install drivers, not manually or automatically but with 1.3.7 I could. Then I opened flirc gui and it asked me if I wanted to update firmware. I updated and vola, flirc was connected.
Edit: just wanted to say that flirc is fantastic! Now when gui is functioning, everything w