Software Update won't update
I'm running 10.15.7 on my 27" iMac (2018). When I go to Systems Prefs, and select Software Update, it throws up the "Checking For Updates...." and just spins and spins until I cancel the request--sometimes after trying for 30 minutes.
I think that the software driving Software Update has been corrupted. How do I fix/reset/replace?
Thanks!
iMac 27″ 5K, macOS 10.15