I could not download it from any of the three sites:
Download.com
Filehippo.com
CCleaner.com
what was the error message?
have you tried the builds page, here; https://www.piriform.com/ccleaner/builds
There was no error message, the download simply didn't start. But I could download it later, and this problem happens most of times with the portable version. It was the first and only time it happened with the installation version. Maybe it was something with my connection. Now everything is OK. Thanks all.