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: Avoid Microsoft: If you don't really like computers much you could make things a bit better for yourself. (posted 2024-12-04 at 12:05:50). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-11-18 Unity Through Division: Sometimes hard decisions need to be made to make genuine progress..