Kurt Lang wrote:
There have been quite a few people having this problem. I don't think anyone has really figured out why it happens. I can still see Mavericks in my purchases (I'm currently running Yosemite as my every day OS) and can download it.
It's odd, I guess the store & the recovery boot may get the installer via different URLs?
Another option is that the OS is misconfigured with possibly bad/ poor DNS servers that are causing the App store version to fail. A recovery boot will use the default DNS server that the router provides.
I have seen posts recommending using Google DNS (8.8.8.8, 8.8.4.4) & other posts suggesting to avoid Google DNS for fixing the App store downloads issues. The CDN may be part of the issue too.
It's possible to download via recovery mode & abort the installer, which allows you to keep a copy, useful when the store is being useless…
http://www.macworld.com/article/1165337/create_a_bootable_lion_install_drive_for _newer_macs.html