After installation, when I try to run the game, a steam window pops up and says "Game currently unavailable. Please try again at another time." (This game is damn well available, I live in America and bought it at midnight release.) I have been trying to correct this issue for the past few days and failed. If anyone can help me it would be much appreciated, thanks.

1. Have you tried restarting Steam? I get that problem a lot with some of my Steam games, and usually a quick restart fixes the issue.
2. Try verifying the integrity of your game cache. If all files are there, then there shouldn't be a problem.

I don't know what else to tell you from there, other than to wait it out and see if it resolves itself.

Thanks for your help. Lol I was afraid I was one of very few with this problem. I have done what you say many times. Restarting/Updating/Refreshing steam and attempting to verify the files, and one file always comes up unverified. And also, like you say, I am afraid I am just going to have to wait it out.