Online Data

Why when I delete all the files or some files from this folder - the game crushes?

because the game is trying to use them? if you dont want them there, right click the last file and make it read only. then the game cannot delete the files, and will not use them. just know that then you cannot get automatic updates from 2k

Which one? Version.txt?

sure, any of them will do

The game is still crashing...

then dont delete those files.