Why is Searching for Updates spinning?
Trying to upgrade iMac and the Searching for Updates wheel keeps spinning. Is there a way to work around this?
iMac (2017 – 2020)
Question marked as
Software Update stuck on "finding updates" with no end in sight it is a known bug.
Several workarounds have been proposed, such as restarting your Mac in "Safe Mode" and checking for updates while in that mode, and / or resetting NVRAM. Try both: