keeps trying to update with macOS Monterey…but can never complete. I don’t think this mac has enough space….anyway, what do i do and how do I download the latest security upgrade from Apple?
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Not enough space is very often the reason one cannot complete updates. To see how much space you’re currently using you can go to “about this Mac” under the apple in the top left corner of the screen then select “storage”. Generally, you’d need about 30+ gigs available in order for updates to run comfortably.

In this same area you can check what version of the operating system your running as well. Going from one OS to a newer one does take a lot of space. Catalina to Big Sur to Monterey to a few months away called Ventura.

Let me know how much space you have and what OS you’re on.