Someone please help me out

I had to buy a flash drive to download halo 4. The problem, is that I can’t download any game variants or theater clips from peoples file share. Will someone please explain to me how I can go about doing this?

> I had to buy a flash drive to download halo 4. The problem, is that I can’t download any game variants or theater clips from peoples file share. Will someone please explain to me how I can go about doing this?

You can’t or you don’t know how to?