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Do you use antivirus? It's a common problem that antivirus false alarm deletes the game files which causes the game to not play properly. Or, there's a chance the game isn't downloaded properly as well, but the error message should occur during unzipping process. 

I'm not entirely sure of this unzipping thing since I'm not that good with computers and all :/  But I'll try to figure something out.

I got it to work now, thank you for your help! :D