(re: Help me please, I’m desperate!)
First off, Do yourself a favor and DO NOT buy the Hobbit game…
That said, to un-install the game, just delete the “SQ4” folder from your Sierra directory.
Then try isntalling again. (Most likely futile, maybe 256 color mode would help?)
Beyond that, I will need to know what type of system you are using. More to the point, what operating system, video card, etc. Then I am sure there are many others here who can offer you support on a newer system.
Good luck and most of all WELCOME HOME 🙂