imac not updating os
System preferences is indicating there is an OS software update (I am using Catalina) but when checking for updates I just see the wheel of doom...
iMac 27″, macOS 10.15
Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. If you're able to access the Software Download install from the Safe Mode.
NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.