Mana Games

[FriedlandH]

Hi, I already have the full version of Tennis Elbow 2013 on my Mac. I want to install the ITST Mod 1.17 version on my Mac but I kept on copying the key txt and then I put it in the Tennis Elbow folder. When I launched it, it said the key code is unknown. Then it launched the demo version and it said buy the full version. I already have the full version. I tried everything over and over again and nothing is working on my Mac. I need easy step by step instructions to install ITST Mod 1.17 version.

Thank you.
Hope