How do I download the most current MacOS software? I have version 10.9.5. Each time have tried to get the most current, the system says it's not avaiable.
Which exact model Mac do you have? It depends on the model which version of OS X/macOS you can upgrade to. If your Mac doesn't support the latest macOS Monterey, you will need to get an installer from this page: How to get old versions of macOS and possible create a USB installer using one of these commands: How to create a bootable installer for macOS depending on the version.
Software Update will only offer updates to your current version of OS X/macOS and the latest version of macOS if you Mac supports it.
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