First time buyer on GOG, does anyone have a work around? Just won't launch the game at all.

Same thing happened to me.
Try to launch "Rayman3.exe" directly from the installation folder.

Launching it via GOG Galaxy doesn't work. Wierd.

Well the BR3_Config crashed and gave me the ability to debug it (i don't know if this utility is original or part of "Better Rayman 3") and it said that it couldn't find "C:\Windows\Ubisoft\ubi.ini".
So after creating an empty ubi.ini in the given Directory the Game and Settings Utility launched.

I hope that it fixes the problem of someone else.

@SlypheedW

Oh my god, thank you very much! This did it for me!

@SylpheedW

Been trying everything all over the internet, but this was what did the trick for me. Thanks!