Hello All: I installed El Capitan because I'm nosy and love upgrades. I'm a member of public beta, but not developer beta, so I installed from an ISO torrent. For those interested in doing the same, don't. Wait for the public beta. El Capitan, even under Beta 2, is unstable, most applications either don't work or won't install, etc. No anti-Malware software works for it yet besides Clamxav, and I am debating whether it knows which folders yet to scan or whether its missing folders in its scan. I am trying to downgrade to Yosemite. I've downloaded the Yosemite Install App, and when I run it from El Capitan, it says it can't install a previous version. So I made an install USB. I rebooted to the USB, and it tells me the same after it unpackages the install application. It appears the only way to downgrade is to reboot into recovery mode, reformat the hard drive, and then install from the USB. But everyone has told me El Capitan is downgradable. Downgradable implies you can downgrade without wiping your hard drive. Anyone have any ideas? I can wipe my hard drive, but I'd rather it just downgrade while keeping my files.