I'm hoping someone here can answer my question. I have a friend at work that would like to upgrade to Leopard from Tiger, but is a little gun shy after hearing about install related issues with it.

You need to download the macOS file from Apple Store. You need to download the macOS BugSur file from the Store, since it is a large file, you need a good enough ...

macOS Monterey version 12 is a stable, lightweight upgrade that works great on older Macs, and you can use the direct DMG or ISO links to download, install, upgrade, or downgrade your system easily.

The Basilisk II emulator can be used to run old versions of Mac OS 8 and System 7 on a modern Mac. Here's how to get started using it. Before macOS and OS X, there was Mac OS 9, and before that were ...