I have a Mac Mini here that I just reset (wiped everything). When I try to reinstall OS X Mavericks through the "Install OS X" interface, I am seeing this error message:
This Apple ID has not purchased "OS X Mavericks".
You must sign in with an Apple ID that was used to purchase "OS X Mavericks".
How do I purchase "OS X Mavericks"? Weirdly I was not able to find anything online. I do not have access to a different Apple device or physical media.