I stupidly downloaded the new OS X Yosemite 10.10 on my 2011 iMac that does all of my Pro Tools work and now some of the things I use aren't compatible yet. So I'm trying to figure out how to downgrade back to OS X Mavericks 10.9. I also stupidly don't have a Time Machine Backup or this would be way easier.
I learned you could install the old operating system with a clean install from a bootable drive with the installer on it, which I've figured out and made, but I don't know if there is a way to install it with wiping all the data on my system hard drive. I read you can transfer files back and forth from a Time Machine backup, but I can't seem to find out if I make a backup of my computer as it is, now with the current OS X 10.10, would those files and applications be transferrable to a clean install of OS X 10.9.
If there is a way to use my bootable install of OS X Mavericks and have it replace OS X Yosemite, and to keep all my files on the hard drive, that would be easiest.