software update for iMac, 2013 running macOS Catalina
I am unable to update google chrome on my mac because the iMac is still using Catalina 10.15.7 but i can't get it to do a software update because it says Big Sur is unavailable whenever i try in the App store. I was hoping there was a link or maybe someone knows how i can get the next software upgrade to Big Sur or higher? Im so confused Im not sure i even no what I'm doing other than trying to update the software. Hopefully someone takes pity on me. This was my Mom's computer and it is still working great ..just needs a software upgrade. This is a iMac 27", late 2013 if that is any help. Thanks in advance for any thoughts or suggestions you might have.
Earlier Mac models