I have the same issue. jesterday i installed the .18 version and i had the request to update while game is fully updated.
I was able to play 1 game before i installed the new mod. after installation this happened. i even tried uninstalling the modpack and this didnt help either.
I just installed the latest one (.19) and still have it
Edit:
Tried downgrading to the .17 no help. Tried running installer as Administrator also no help, same with running the wot-launcher as admin.
I fear that reinstall of the game or waiting for an update will be the only solution.
python.log
_Aslain_logs.zip