Older Mac operating systems can be downloaded if you know the correct URL. Here is a list of old Mac operating system installers I have found...
Download Mac OS X Snow Leopard: http://adcdownload.apple.com/Mac_OS_X/mac_os_x_version_10.6_snow_leopard_build_10a432/mac_os_x_v10.6_build_10a432_user_dvd.dmg
Download Mac OS Leopard: http://adcdownload.apple.com/Mac_OS_X/mac_os_x_v10.5_leopard_9a581/leopard_9a581_userdvd.dmg
Mac OS X Lion 10.7: https://support.apple.com/kb/DL2077?locale=en_US
Mac OS X Mountain Lion 10.8: https://support.apple.com/kb/DL2076?locale=en_US
OS X Yosemite 10.10: https://support.apple.com/kb/HT210717
OS X El Capitan 10.11: https://support.apple.com/kb/HT206886
macOS Sierra 10.12: https://support.apple.com/kb/HT208202
macOS High Sierra 10.13: https://support.apple.com/kb/HT208969
I usually write a blog post about once a week. The latest post can be viewed here: Think for Yourself: In the end, everything is just an opinion. Be skeptical, and think for yourself! (posted 2026-04-25 at 21:12:02). I do podcasts too! You can listen to my latest podcast, here: OJB's Podcast 2026-04-14 How Far is that Star?: How would we really know how big the universe is?
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