Downgrade from OS X Mavericks
31948
Roll back from OS X Mavericks ( or any newer OS) to Mountain Lion
5114
Can I delete any of the default apps the come with OS X?
60029
Which macs are compatible with OS X 10.11 El Capitan?
7700
How to install OS X Mavericks if disk only has Windows on it?
7969
Can I downgrade SQL Server 2008 R2 Standard To Web Edition?
8401
Downgrading MacBook Pro 16” to Mojave
112347
How much of 32-bit support is dropped in macOS Catalina?
67141
How to set system-wide environment variables on OS X Mavericks
21264
Official way to obtain an OS X ISO file
126343
How to downgrade a package via apt-get?
151232
downgrading rails 4 to 3.2
24788
Downgrading from iOS 8.1 beta 2 to iOS 8.0.2
3670
How to downgrade an app if it has been updated via Play Store?
133969
iMac crashes after upgrade to OS X Mavericks
106321
Finding out if upgrading to a newer macOS version will cause issues?
148808
Update from Mac OS X 10.6.8 to the newest version
67218
update OSX Yosemite & cksum mismatch