I have two computers: a PC with internet and an iMac without internet. I recently bought a digital game download from Amazon for my Mac so when I downloaded the file, a .DMG downloader file shows up. I know it's not all the files for the game because it's just 4MB and the game is like 4GB. I can't extract it on my iMac because it's not connected to the net so is there anyway I can do that from my PC?