Releases of Mac OS X prior to Mavericks were paid upgrades. As such, full installers mostly do not exist for these versions. Apple made exceptions for Mac OS X Lion and OS X Mountain Lion, which were released as a free download on the Apple Support website on 2 July 2021. On 24 October 2019 and 10 February 2015, in preparation for an Apple Software Update certificate expiring causing installer packages to display an integrity error and refuse to install, Apple reissued many updates, signed with a new certificate.[1][2]
To install copies of macOS without updated certificates, change the Mac's system clock to sometime prior to 24 October 2019 before attempting installation, and reset it to the current date afterwards. If the Mac doesn't have an existing operating system installation, this may be done from the installation environment by clicking Utilities → Terminal, then entering date 1001000019 to set the date to midnight on 1 October 2019. Press ⌘Q to quit Terminal and return to the installer.
Most downloads are a patch updater (upgrading directly from the previous version), or combo updater (upgrading from any earlier version in the same major release). To perform a clean installation of macOS, use a full release build.
OS X Mountain Lion is the first release to move server components from a separate operating system release, to an OS X Server application installed on top of the operating system.
- Apple Store product listing (no longer available as of November 2023)[3]
- App Store listing (no longer available)
| Version | Build | Release Date | Download URL | SHA1 Hash | File Size | Documentation | Notes |
|---|---|---|---|---|---|---|---|
| 10.8 | 12A269 | 25 July 2012 | Paid Release | — | — | — | |
| 10.8.1 | 12B19 | 23 August 2012 | OSXUpd10.8.1.dmg[dead link] | ? | ? | Release Notes [Archived 2014-08-13 at the Wayback Machine] | |
| 10.8.2 | 12C54 | 19 September 2012 | OSXUpd10.8.2.dmg[dead link] OSXUpdCombo10.8.2.dmg |
?ba9c7f07abc9da1c8bb1798f5756baa3941beefd
|
? 697,635,080 |
Release Notes [Archived 2014-09-23 at the Wayback Machine] Security Notes |
|
| 12C60 | 4 October 2012 | OSXUpd10.8.2Supp.dmg | c81731a9c562eb06f86efbfb55e3cc9523ad9730
|
27,876,466 | Release Notes [Archived 2014-09-23 at the Wayback Machine] | ||
| 12C2034 | 23 October 2012 | ? | ? | ? | — | ||
| 12C3104 | 29 November 2012 | OSX10.8.2SupplementalUpd2.0.dmg | 75954a6493558fb468b27d2859f1437a2e17efde
|
1,197,722 | — | Update reissued due to "Volume does not meet requirements for this update" error. | |
| 10.8.3 | 12D78 | 14 March 2013 | OSXUpd10.8.3.dmg[dead link] OSXUpdCombo10.8.3.dmg |
?0222e5060740a80f846559d4f708b84574042a85
|
? 832,220,952 |
Release Notes [Archived 2014-10-10 at the Wayback Machine] Security Notes |
|
| 10.8.4 | 12E55 | 4 June 2013 | OSXUpd10.8.4.dmg[dead link] OSXUpdCombo10.8.4.dmg |
?2d5f272dc19ddf1733eb22cf045cf7ae9f627ea7
|
? 849,326,635 |
Release Notes [Archived 2014-08-29 at the Wayback Machine] Security Notes |
|
| 12E3067 | 10 June 2013 | — | — | — | — | Initial release for MacBook Air (Mid 2013) | |
| 12E4022 | 25 September 2013 | Initial release for iMac (21.5-inch, Late 2013) and iMac (27-inch, Late 2013) | |||||
| 10.8.5 | 12F37 | 12 September 2013 | OSXUpd10.8.5.dmg[dead link] OSXUpdCombo10.8.5.dmg |
?9a213a75d4f84b9bed497b1b5ebd6d807d4082b6
|
? 872,364,619 |
Release Notes [Archived 2014-09-12 at the Wayback Machine] Security Notes |
|
| 12F42 | 24 September 2013 | ? | ? | ? | Release Notes [Archived 2014-09-12 at the Wayback Machine] Security Notes |
||
| 12F45 | 3 October 2013 | OSXUpd10.8.5Supp.dmg | 5b10d728f5043e7b056e24f30596fa34031d859d
|
19,662,726 | Release Notes [Archived 2014-09-12 at the Wayback Machine] Security Notes |
||
| 2 July 2021 | InstallMacOSX.dmg | 4b9bc933f50abe824b93ba9eebd8f57f1609ccdb
|
4,720,237,409 | DL2076 | Free re-release of Mountain Lion. Does not have updated installer certificate, so system clock must be set earlier than 24 October 2019 to install. |