Download old version of Mac OSX legally as Apple Developer? I have an Apple Developer license, and an old MacBook that I want to use only as a build server for developing Phonegap applications.  

The Mac is too old to get anything newer than 10.9, but in order to use correct IOS SDK, it needs 10.9 or newer.

I was able to find and upgrade from 10.4 to 10.6 with no problem, but I can't seem to find Mavericks as a complete install or update file.  Unless I am missing something.  I looked in the developer downloads, but all those downloads seem to be upgrades only for people who already own 10.9.

Does anyone know how I can do this?  

I never owned any version of OSX that I can go back and get the installer for as this computer was a gift that had never been updated beyond 10.4. My intention is 'pure'.  Seems like I should be able to do this somehow.

Thanks
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.