How can I update software on iMac not connected to Internet

Question

I recently gave my old iMac to my parents, and they don't currently have internet access.
Is there a way I can somehow get software and security updates installed? Was thinking maybe downloading on my computer without installing, then taking them on a flash drive to install on the non-connected computer, or something along those lines. Or maybe there's another way to obtain the updates...?

Answer 1

First, you need to know what you need. And somehow you will have to get your parents' Mac connected to find out what they need.
Then you can download individual updates from Apple Support. Click on View All Support Downloads in the upper right corner.
Word of caution: you don't need to constantly update the machine, in fact it's better if you don't, esp. if the machine is working properly. Check a couple of times a year; decide whether or not you really need the updates. Apply only what you need. If you poke around the forums you will discover that a lot of people cause themselves their own problems by doing automatic updates and/or not researching the update(s) first, and/or not thinking through what they're doing.