Always ensure your installation is fully updated, as older macOS versions no longer receive active security patches.
Apple transitioned to a 64-bit kernel and architecture years ago. If you are looking for the most stable versions for virtualization (like VirtualBox or VMware), these are the top versions to consider: mac os x iso download 64 bit top
For older 64-bit versions like High Sierra, Sierra, El Capitan, and Yosemite, Apple provides direct .dmg download links that must be opened in Safari. Terminal (Advanced): Always ensure your installation is fully updated, as
If you have a Mac, you can use the Terminal to convert the official installer into a file suitable for virtualization: mac os x iso download 64 bit top