Unity builds old version of my Project - help!

Hi, I found a few threads trying to figure this out but none of them were answered actually or at least I didn't see the answer. So I have latest Unity 2018.2.13f1, PC, Win10, I'm building into completely new folder on the Desktop, I have all scenes selected in Build Settings. But after Unity finishes building and I launch the game via Game Resolution dialog - the game quits, and after a few tries to relaunch it - it launches old version of my Game which is about 1 month old.. I can play the game normally from directly from Unity without any problems. Please help!

Update: Found out what was the problem - just had to add steam_appid.txt in the root of the build folder..