How do I install Mac OS X El Capitan on my other iMac?
109386
How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer
23781
Incompatible Software for next OSX?
43279
Alternative Method to Acquire El Capitan Upgrade
41511
How to use a different mirror of macports rather than the offical mirrors?
128744
x86 Assembly on a Mac
93193
This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading
102362
Install older OS X on latest Mac Mini
149786
How to restore Mac OS X on a new hard-drive?
76134
Can i change the default Mac App Store install folder?
31268
Revert to El Capitan
70136
How to build a dmg Mac OS X file (on a non-Mac platform)?
116657
Install an older OS X version on an external volume
46084
Can I downgrade from macOS Sierra to Snow Leopard (OS X 10.6)?
62702
Mac OS X for VirtualBox
87258
iMac won’t boot up from internal drive but can boot from external drive, but internal drive can boot other Macs
64468
How do I migrate my Keychain's "Local Items" to a new Mac?
141372
OS X El Capitan and older not available on App Store?