XPost Facto runs under Mac OS 9 and works around those limitations – version 4 supports OS X 10.2 through 10.4 on many unsupported Macs.This is the oldest version of OS X that still has a few relatively up-to-date browsers to choose from, although recent browsers such as Camino 2 and Firefox 3 are not compatible with it.

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It followed Mac OS X 10.2 and preceded Mac OS X Tiger. Since a New World ROM was required for Mac OS X Panther, certain older computers (such as beige Power Mac G3s and ‘Wall Street’ Power Book G3s) were unable to run Panther by default.

Third-party software (such as XPost Facto) can, however, override checks made during the install process; otherwise, installation or upgrades from Jaguar will fail on these older machines.

You get access to new features that make your Mac even more useful and fun.

Upgrading ensures that you have the latest security features and performance enhancements. Before you upgrade, we recommend that you back up your Mac.

If you don't have the App Store on your Mac, get updates by choosing Software Update from the Apple () menu.

If you don't see an expected Mac update: Learn how to upgrade to the latest mac OS version, which includes the latest version of Safari and the Mac App Store.

You can set your App Store preferences to ”Download newly available updates in the background.” If you're using OS X El Capitan v10.11.5 or later, these updates include major new mac OS versions, such as mac OS Sierra.

Your Mac then notifies you when the updates are ready to install.

Once you have the 10.4 disc (most of which are 10.4.3), download the 10.4.8 combo updater from Apple and you're good to go (avoid 10.4.9, it has some bugs with certain Mac models).