Upgrading from Yosemite to El Capitan, but not Sierra
4309
How can I download an older version of OS X/macOS?
39340
Changing Default Apache version on MacOS Sierra
11780
How can I download the macOS Big Sur installer on a Mac which is already running Big Sur?
97346
Is it possible to skip releases during an upgrade?
69161
Is there a way to virtualize Mac OSX in Windows?
1520
How to install software or upgrade from an old unsupported release?
66221
How do i install OS X on new hard drive? I have macbook pro mid 2010.
35093
Upgrading from the command line?
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
60029
Which macs are compatible with OS X 10.11 El Capitan?
150010
Installing Mavericks on a brand new machine that shipped with Yosemite pre-installed?
121309
How to downgrade from El Capitan to Snow Leopard?
12273
Why do I get a ‘Remote Management’ step when installing High Sierra?
78427
I can't reinstall my OS X El Capitan. "Please Run Install OS X El Capitan.app"
121136
How to fix "macOS needs to repair your library to run applications" after High Sierra upgrade?
141372
OS X El Capitan and older not available on App Store?