ChickenFromMars

I have a Mac, and most of the packs I get work, but Infamy: Modern Warfare won't work. I will open it, and it does the right stuff, but it doesn't load. I have also tried it on other Macs and it still doesn't work. Is there something I'm doing wrong?

I have a computer with Windows XP software, but I can't connect it to the Internet. Is there a way I could make it on the Windows computer and transfer it to another computer with Mac software and upload it and test it out?

Okay so I was trying to make a custom pack, so I could have some of my favorite mods on it. If someone could help me, that would be awesome! Also, I can't watch YouTube because of restrictions. Does it make a difference if the software is Windows or Mac? If you could leave step by step instructions and specify what software it is on, (Windows/Mac) that would be amazing!! Thanks