I have followed the special readme and still have this problem.
imgur.com/a/O8mNAt6
Which version of the old trainer should I run or does it not matter? So far I've tried the 2nd latest version, then the one on the 5th of april to reset the files as stated in the read me.
Please note that after seeing that error, to play the game again I only need to not have the latest trainer running and everything goes back to normal and I could connect into the game. Didn't even have to verify gamefiles.
Did you went through this? -> Link
Yes I did. I made sure to delete everything. I did install the game back on the same drive though dunno if that has anything to do with it although I doubt it.
Annex in file.
You need to uninstall the game, delete the entire Vermintide 2 folder. Reboot. Reinstall game. Play game once without trainer. Then run trainer as shown here:
Finally........ I can use trainer into the game
I delete whole game folder then reinstall and it's works!
Yay, someone actually did what I've said at least 10 times now in this thread. But I guarantee it will be asked again and again.