Even if CCleaner's auto-update feature is enabled it, like most, is not really fully automatic (or at least it's not for the free version). It will tell you that an update is available, but you still need to download and install it yourself.
I generally keep only the latest version of any software I use regularly. It doesn't matter if "the old version" works since, when or if it doesn't, there's no support and the first question anyone (including on forums like this one) is going to ask is, "Are you running the latest version?" If the answer is, "no," then the first response will most likely be (and should be), "Download and install the latest version to see if that solves the issue."
[I'll hold on to prior version installers until I've verified that I'm not having issues with the latest version, though. After that verification they're promptly nuked.]
Edited by britechguy, 20 September 2017 - 10:05 AM.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story