Almost half of the downloads are failing when anti phishing is enabled. Those downloads are genuine downloads and definitely should not be blocked.
Would you mind providing us with any examples of the links that you're having trouble downloading from so that this can be looked into further?
If you do not wish to provide the links in a public space, please get in touch with our support team via the Contact Us form located here: https://support.piriform.com/hc/en-us/requests/new?ticket_form_id=86507 or by emailing support@ccleaner.com directly; in either case, please provide sample links and we'll be happy to investigate this.
P.S. Counter-examples would also be helpful! For instance, if half the links on a site are working and half are not, then having examples of both good and bad links would help us compare them.