DO THIS BEFORE RUNNING INSTALL.BAT 1) Download and install Microsoft .NET Framework 4.5.2. If you already have it, skip this step. https://www.microsoft.com/en-us/download/confirmation.aspx?id=42643 All .NET 4.X Framework versions: https://msdn.microsoft.com/en-us/library/5a4x27ek%28v=vs.110%29.aspx ------------------------------------------------ ABOUT INSTALL.BAT - Automatically compiles OpenRA with Tiberian Sun & Red Alert 2 from the source for you - This is the file you need to execute if you're looking for installation of OpenRA with Tiberian Sun & Red Alert 2 - Double click to execute it ------------------------------------------------ - Once the install.bat script has compiled the game, there should be many warnings but not a single error message as output. I got 52 errors if I had only .NET Framework 4.5 installed. - I got only 13 warnings after I installed Microsoft Windows SDK for Windows 7 and .NET Framework 4 (https://www.microsoft.com/en-us/download/details.aspx?id=8279) - However, the number of those warning messages didn't affect my gameplay in any way. That's why I'm not sure if you need to worry about them. I can't really recommend to install 1.7GB of unneeded stuff on your PC without a very good and valid reason. - If you feel it important or your game crashes etc., please consider installing that SDK stuff and re-running the install.bat the game. ------------------------------------------------