@Devastator: Yes, I tried extracting everything again from fresh downloads off the forum links, but it didn't work unfortunately.
@MephistoRoss: Your workaround has resolved the issue, thank you! I originally ruled out the non-latin characters as the issue, since I tried logging in with an english user profile on Win 10, and it resolved the same issue with Dishonored 2, but not with Battleforge. I didn't realize Windows lets you change your docs folder location; I moved mine to root C:
Again, thanks so much! I tried a solid 8 hours of troubleshooting before reaching out, and I still couldn't solve it, haha. Now I can finally get the BFP from playing rPvE!
( ◜‿◝ )♡