Downgrading from 10.9.5 to 10.9.4
135547
Downgrading from OS X 10.9.2 to 10.9
149044
Can I downgrade to an earlier version of Android after installing an OTA update?
108999
Downgrading from SQL Server 2008 to 2005
26773
How to downgrade a Windows Phone 8 app?
97346
Is it possible to skip releases during an upgrade?
102057
How to keep two versions of an app installed?
67481
How to revert a do-release-upgrade?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
140371
Update Ubuntu 10.04
105231
How to downgrade a package using dpkg
3670
How to downgrade an app if it has been updated via Play Store?
7521
Revert Android Update 4.0 to 3.0/3.2
48939
How do I install an older version of an app on an iPhone?
11556
Can I smoothly upgrade from one LTS to next LTS release?
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
95336
Installing particular versions when repo has newer versions?