New
#11
Found ccsetup538_slim.exe. If your browser has trouble downloading it (Firefox did) then try Edge.
Wayback Machine
I run the Slim version and it seems to include no bloatware, extra stuff, or ads of any kind. Currently on version 5.50. Just sayin...
--Ed--
Currently running version 5.35 of CCleaner, when installing on a clean installed system, I make sure internet connectivity is disabled temporarily. That gives me time to rename ccleanerupdater.exe to ccleanerupdater.bak to disable it permanently.
FYI: Read this if you only want to install Ccleaner Slim Build (latest version) and avoid auto updating to the regular build when a new version is released.
Issues with Ccleaner - Windows 10 Forums
CCleaner - Builds
RE: Old versions of Ccleaner. They will not contain fixes and may cause problems.
CCleaner - Version History
For all old versions of ccleaner (not slim ones though), all the way back to CCleaner 1.16.082 (Released: 27 Nov 2004) check here:
CCleaner 5.50.6911 - History - FileHippo.com
When I was getting the annoying Black Friday adds, I uninstalled version 5.48.6 and installed 5.40.6. Unfortunately I still got the adds, uninstalled 5.48 and installed 5.38 that was the end of the pop up adds. It appears that any versions after 5.40 seem to have been tweaked by Avast. 5.38 is running great.