You won't let me update my present version for a reason I do not understand.
'0x6: The handle is invalid' is a Windows error code, something is stopping Windows from fetching/applying the update.
It is more prone to happen following a Windows update, and is occasionally seen when updating CCleaner (or any other app).
One (or both) of the two suggestions given here should get you updated again:
https://community.ccleaner.com/topic/58573-0x6-the-handle-is-invalid/?tab=comments#comment-321089