CCleaner disappaered after todays windows10 update

CCleaner disappaered after todays windows10 update, had to reinstall it, working now again

I've only seen two Defender (Security Intelligence) updates today, plus the Optional Quality Update for 20H2 (KB4580364) is still pending but that will not download/install unless you choose to click it.

Windows 10 update is sometimes known to remove CCleaner, usually it's an old(er) CCleaner version which hasn't been updated in a while.

Windows decides that the old CCleaner version is not compatible with the Windows update and so removes it.


(It's not just CCleaner, it sometimes does it for other software old versions as well).

As you have found, if that should happen then reinstalling the latest CCleaner version is the thing to do.