How to install the latest compatible MacOS version?
4309
How can I download an older version of OS X/macOS?
106321
Finding out if upgrading to a newer macOS version will cause issues?
36892
Upgrading from Yosemite to El Capitan, but not Sierra
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
109386
How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer
144175
How do I install and keep updated with the most recent versions of Blender on Ubuntu?
70391
How to install latest Arduino IDE?
136928
How to get Ubuntu download for a Mac?
141372
OS X El Capitan and older not available on App Store?
112347
How much of 32-bit support is dropped in macOS Catalina?
107149
Is the current version of Ubuntu usable on a PPC mac?
60659
Install newer package version from trusty-backports
139401
How to install the latest version of WINE as the system version?
22323
Install macOS Sierra on VirtualBox?
155154
I am currently using 19.04 and I got "No new release found for 19.10"
38925
Can you update to macOS 10.14 (Mojave) without converting to APFS?
102362
Install older OS X on latest Mac Mini