How/where exactly did you install it?
I also have the GOG edition. I installed in it the GOG/Arcanum folder. Installation seemed to go well. But whenever I try to launch the game something weird happens. The launcher seems to continually open and close. And all open programs seem to be alt-tabbing or it might be that my resolution is continually changing or something. Anyone have an idea what's causing this?
I just followed the steps: "D:\GoG\Arcanum\Arcanum" - then to launch the game, use Config.exe, from that directory.
These are my settings
EDIT: Uncheck "
Enable autoupdate..." only after it installs the latest patch, if you want. Otherwise it checks for updates with every launch.
Also, in the same directory, use HiRes.exe if you want to tweak your resolution -
uninstall then reinstall. HiRes sets a default and the Config launcher MUST match it, or the game won't run.
Hope that helps!