Grimrock

When i try to launch on steam it says "legend of grimrock not available at this time"

Simply try to start it again, it's a common steam error when the Server is busy to handle the request but usually vanishes already after around 30 seconds if not less.

It's a steam thing. If it doesn't work in a few minutes restart steam, if that doesn't work go to your steam install folder and delete clientregistry.blob, log back in and THEN it should work.