Windows 10 Defender flags CCleaner tool as an unwanted application
CCleaner - Download
CCleaner Professional: Top-notch PC maintenance - PCWorld | Everand
Change update settings in CCleaner for Windows
Download CCleaner 6.09.10300 for Windows - Filehippo.com
CCleaner om je pc sneller te maken - How to (Consumentenbond) - YouTube
If you use CCleaner regularly and have found that Windows 10 isn't learning your search behavior, be sure to uncheck the box next to MS Search. It worked wonders for me. :
Download CCleaner Portable - MajorGeeks
Windows operating system cleaning rules
CCleaner 6.19.10858 Free Download for Windows 10, 8 and 7 - FileCroco.com