I'm using gog installer and the game ALWAYS says it failed instalation.
I tried vereifying multiple times and still says the same.
Anyone know how to fix it?

Have you tried re-downloading the installer, in a different browser?

If you have Galaxy, try installing it directly, with the client.

Are you running the .exe file in adminstrator mode?

If nothing works:
https://support.gog.com/hc/