So, We have 2 computers, 1 is my parent's and the other is mine. I downloaded Portal onto their computer, and it works. On my computer, I don't have internet access, so I have to download things off of their computer and put them on mine. I wanted to play Portal on mine, so I copied the "steamapps" folder onto my pc and restarted Steam. Portal shows up in my favorites, but it says purchase instead of play, and none of that backgrounds and stuff is there. So, do I have to say, make a Steam folder on the memory drive and install Portal to that, then copy the folders to that, and make sure not to override anything I need for offline mode, like I did with Deus Ex, or is there another way not involving getting internet, because I can't.