revert to Mavericks without TIme Machine backup
I made the mistake of upgrading to Yosemite while a program that I need to use is not supported and won't ever be.
I did this without a Time Machine back up.
I want to revert to Mavericks without having to wipe the entire drive - I have a separate HD with Mavericks installed so I can boot from that - If I simply try to install over the Yosemite drive will it keep data, such as prefs and etc from the Yosemite system drive? or do I have to do a clean install?
Mac, Mac OS X (10.3.9)