Download old version of Mac OSX legally as Apple Developer?
Log into your account and navigate to the summary account overview page:
-
https://developer.apple.com/account/#/overview/
- Select Downloads
- Scroll the page so you can see additional downloads at the bottom
- Uncheck all but OS X category
- Search for 10.9 and grab the combo you want.
At that point, open a case with developer support and ask them to send you a redemption code for 10.9 for your Mac App Store account.
Sadly, I have discovered that this is not possible. According to Apple, Mavericks has been phased out and can no longer even be purchased.
This seems stupid and pointless; but it probably allows them to avoid the pain of writing certain kinds of updates; dealing with backwards compatibility, etc.
I'm sure Mavericks can be had on eBay or somewhere else. That said, this was not the outcome I was hoping for.