I have stopped using CCleaner totally, my reasons are nothing to do with Malware, (well sort of

). Piriform, the developers have recently been bought by Avast, The anti-Virus Company.
Since this takeover the installer for CCleaner (and possibly other Piriform Products), have been reloaded with "offers" for other Avast software.
These "offers" are often pre-checked so become what the AntiMalware industry, (including Avast), call PUPs, (potentially Unwanted Programs). Some cases have also been reported where there is no way to "uncheck" the offer for the Avast Free AV package, Even if you have another competing product, which in my opinion is the act of Malware.
Of course standard practice has always been to avoid running two active malware scanners at the same time as they are likely to cause confusion and lead to major issues, this policy by Avast invites this especially for those that do not have a lot of experience.
The avast installer does not run if Avast is already installed so they have the code to check for existing AM products so they seem not to be concerned about the potential issues thatthey are inviting
As I feel that this is a nefarious practice I have stopped using the Avast products including those formerly supplied by Piriform as there are alternatives that can be used Wise Disk Cleaner, Revo Uninstaller (I have Pro which includes Cleaning).
If you wish to use CCleaner, as it is still technically a good program, I would advise that you always run the advanced installer and check for pre-checked options, or better still wait s week or two after the initial release of a new version and search the CCleaner Site for a Slim version (which should not contain any free addons)