I have never before had installation problems with CCleaner but the last two updates WILL NOT install at all. I read that Malware Bytes Premium interferes. But I have the non premium version so that should not a conflict. I have tried logging in as administrator and still will not install either version (downloads fine but will not install). I am running Windows10 fully updated and there have been no changes to the computer since I downloaded and used v.5.53. I have used both Firefox and Edge to see if it was caused by a browser and still fails under either. Driving me crazy (especially with the incessant reminders to upgrade to the latest version) and just need to know step-by-step how to fix this.