The latest macOS version is Monterey — here's how to check if you have it and how to upgrade

You can see if you're running the latest macOS version by clicking the Apple logo in the top-left corner, then selecting ...
CNET

When a Mac OS X update won't install with "Volume does not meet requirements for this update" message

The error message "Volume does not meet requirements for this update" may appear when attempting to install a Mac OS X updater or a full release from disc. Generally ...
Macworld

How to check a Mac’s OS upgrade history in System Profiler

While macOS upgrades should always proceed in a sequential fashion, sometimes things go awry. Typically, the Software Update preference pane shows all updates available for your current release of ...
CNET

Mac OS X 10.4.1: System freezes occurring when in/entering full-screen mode; QuickTime-related

Several experience freezes where the system becomes unresponsive but the mouse cursor can still be moved when entering full-screen mode in various applications under Mac OS X 10.4.x. One reader writes ...