Can install 5.44 but not 5.45 or 5.46

It unpacks the setup and then complain about online setup problem. I have been having internet problems but those are intermittent.

Need more info such as Operating System used, and how and where you are downloading CCleaner from.

Windows 7 Premium Japanese Version.

Cnet- the link Piriform sets for standard home users. What is how?

Try the download for the slim build from here

https://www.ccleaner.com/ccleaner/builds