How to update Mountain Lion 10.8 to Catalina OS?
4309
How can I download an older version of OS X/macOS?
20625
Just upgraded to Mountain Lion and I have to buy iPhoto again?
70136
How to build a dmg Mac OS X file (on a non-Mac platform)?
38925
Can you update to macOS 10.14 (Mojave) without converting to APFS?
120131
How can I recover from a "AMD-Action:downloadProduct:SP" during installation of macOS?
98543
How can I download Mac OS X El Capitan without app store?
94510
How do I do a clean install of Yosemite?
87984
Can I fresh install a Beta version of macOS?
12164
How do I update my TeX distribution?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
140371
Update Ubuntu 10.04
83960
How do I change my update server in Ubuntu 18.04?
151690
How do I downgrade from Yosemite 10.10 to Mavericks 10.9?
31948
Roll back from OS X Mavericks ( or any newer OS) to Mountain Lion
60077
Fresh install Mac OS Sierra and MacTeX
158735
How to update Wine to the latest version?
113056
How to upgrade from 12.04 to 12.10 using CD?