Downgrade from OSX 10.10 Yosemite Beta to OSX 10.9 Mavericks
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
40455
Cant Re-install Mac os x 10.10
31948
Roll back from OS X Mavericks ( or any newer OS) to Mountain Lion
135547
Downgrading from OS X 10.9.2 to 10.9
27159
Apple Shellshock patch for 10.6?
32200
How do I downgrade a package?
31268
Revert to El Capitan
60077
Fresh install Mac OS Sierra and MacTeX
134561
Is it possible to run Snow Leopard on a LATE 2011 MacBook Pro?
69028
Can I downgrade to macOS Mojave if I buy the new 2019 MacBook Pro?
121309
How to downgrade from El Capitan to Snow Leopard?
41825
How to downgrade from 64-bit to 32-bit
81559
How to install Ubuntu on a Mac and keep OSX?
78758
LaunchPad totally disorganised after reboot OS X Yosemite
148808
Update from Mac OS X 10.6.8 to the newest version
22276
How do I downgrade Firefox v. 57 to v. 56?
22617
Downgrading from Safari 12 (beta) to Safari 11