When I try to install the new expansion, I get a message that there's installer files missing, and to please make sure you have downloaded all necessary parts. You will be asked for their location during installation. Integrity check will be skipped.

The thing is, is that I downloaded all the installer files, and they're all in the proper location. But the installer isn't recognizing this for some reason. What should I do? (I already tried uninstalling everything, and reinstalling it)

I'm also having loads of problems installing this game. Every time I try to run the installer it says my files are damaged. I've already downloaded over 50GB in the last 10 hours trying to get a clean install.

I seriously regret using GOG for this game. Should have got it on Steam.

Same problem

I actually solved my problem. Apparently it was searching for a bin file with (2) in its name. So i renamed the bin file and everything turned out fine.

Which web browser are you using for downloading?

I just now decided to get the DLC for this game, and it's not even recognizing that I actually have the dumb thing. Cannot install White March part 2 either. Should have went with Steam, I agree.