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 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain