I have an Early 2009 MacBook (white) which had Yosemite installed. I am going to sell it so I erased the HDD using Disk Utility. The recovery partition is still available, but when I try to re-install Yosemite using command-R it states 'This file is temporarily unavailable at the App Store'. This is directly after I input my App Store account info. I have also created Sierra and High Sierra bootable USB drives, a bootable HDD connected via USB, and a bootable DVD. However, none of these have worked. When I choose one of them on the startup screen they begin reading, then the computer shuts down. Is there a way to install over the network? I have downloaded both Sierra and High Sierra install files from the App Store.