Very confused about error message. – Soccer Sumos - party game! Review

I downloaded this game today because it said it was free with App Gratis. The problem is, whenever I load the game, it said that the build has expired, and I need to upgrade. Then it gives me an OK button, but when you click the the OK button, that goes away. I have no idea how to upgrade, and I don't even know if I have the $.99 version of the game, or if I still have the free version, but it's very confusing as to what I'm supposed to do if I only have the free version instead of the promised paid version that is supposed to be free. It doesn't say whether it's supposed to remove ads, or whether there are extra levels, or what the difference between the paid and free versions are.
Review by Mom24monsters on Soccer Sumos - party game!.