Is it possible to transfer the (modded) game from one PC to another?

Hello everyone.

First of all, please excuse my english since it is not my native language. Secondly, please also excuse if this is a realy stupid question or if it was already answered, because I couldn't find a solution.

A while back I got a new PC with Windows 10 (as oposed to my old windows 7 one). Because I wanted to continue playing my (modded) BGEE game, I copied my whole BGEE steam folder to the steam folder on my new PC. Sadly, it seems as the mods are no longer working, since it says that mod companions are invalid.
So my question is: Am I missing any files? Is there a difference between windows 7 and 10? Was there a patch that changed something in the game/file structur after February 2017 (last time I played it on my old PC)

Thank you all for helping me.
Sincerely Nikster