Hi, I'm glad for your interest in the game. You may find useful advice in this Hearstone support thread, as both Fragments of Euclid and Hearstone use Unity.
https://us.battle.net/forums/en/hearthstone/topic/20759289081?page=1
They talk about the pink screen issue, how you can try to update your graphic drivers, and at the very end on the second page, several people mention downloading a file d3d9.dll has solved their issues.
I hope you will be able to play and enjoy the game, let me know if it has worked. And don't worry about the money, donation is totally optional.