When I got my beta key I tested it on my girlfriends computer, and logged in to the launcher as myself.

Now I switched to my main computer and gave her my friend key, but I can't change to her user on the launcher. So I'm logged into two machines.

Any help? Am I missing something obvious? I've tried uninstalling and reinstalling.

Dear Support,

We had a same problem here :( My boyfriend logged in to my gog once, and after that, I cannot change the logged in user in the game.
Please help, coz we cannot play private game together.

Thank you in advance!

Hey dude! I read your post and i think i found one solution this problem:)

So uninstall game and delete folder(C:\GOG Games\The Witcher Adventure Game) after this (C:\Program Files (x86)\GalaxyClient) uninstall galaxy too and delete this folder too. Download game without GoGDownLoader. If ask your login info just type your girlfriend (or your... which is missing) account acc and pass.

It works to me and my girlfriend, so i hope help this will help. And sorry for my bad english, i tired :(

I uninstalled and reinstalled. Got to change the user now. Thanks for the tips. :)