I obtained a Mac Air from a friend, second-hand. He restored a clean install of the OS, without the free Apps (iPhoto, iMovie…). These apps were included in the original purchase. We understood that it would be a simple matter of downloading these apps afresh from the Appstore. However, I am required to pay for them. I use my Appstore login, of course, not my friend's.
I guess one way to get these apps is to go and visit my friend and ask him to log in to the Appstore under his identity, but I would prefer to download these myself. I also suspect that this method may cause problems for a number of reasons: the device is now linked to my login, he probably already has his quota of devices linked.