Like most of the mods, it will not work on a Mac natively, because it uses a custom dll. The Mac version does not use a dll but includes everything that is in the game dll in the main C code. There are a few mods that don't use a custom dll and, therefore, work on a Mac. In order to use most of the mods, including Rise of Mankind, I run Parallels with Windows 7 installed in it as a virtual computer. All of the mods work there. If your friend does not have Parallels installed, it can be purchased from the company online for about $60. I bought the Windows version of CIV from GOG for under $10.