Dear Good question users.
I'm going to (probably tomorrow) set the game Portal. The game is relatively large, so that it would be handy if I could now download and could check box to enable it. This works to my knowledge, for example: at Life for Speed, where you can download the trial and then you can select the thereafter without the need to download several GB again. So to my question: Is it working in conjunction with Steam, the demo download (which is already 3.6 GB in size) and then easily activated, without having to download it again?