AppleNever01

Just discovered something interesting that fixed the problem. I copied the Ccleaner setup to a thumb drive and switched to my wife's user page. She is definitely a non-administrator and I have always been the administrator. I then ran CCleaner from the thumb drive and it install exactly as it should. And when I go back to my page it has upgraded to 5.19 also. I was not able upgrade from the thumb drive while on my page. I have no idea what it all means but the problem is fixed. Thanks Nergal, your comment about administrator privileges gave me the idea to try my wife's page for the setup.

Also I am the only user who has administrator privileges on my computer.

I use Malwarebytes Anti-Malware, SuperAntiSpyware, and Norton Security which have coexisted with CCleaner on all my computers for years with no problems. And I don't think CCleaner is running when I try to run the setup. Usually my computer tells me when I need administrator privileges and don't have it.

When I try to upgrade from 5.14 to 5.19 I get the following message: CCleaner v5.19 Setup Error opening file for writing: C:\Program Files\CCleaner64.exe Click Abort to stop the install, Retry to try again,or Ignore to skip this file. If I hit Ignore or Skip v5.19 doesn't install. I assume it has to do with the Windows 10 upgrade I did at the first of the year. Been fooling with this for the last five months now.

I upgraded to Windows 10 two weeks ago. I just tried to install a Ccleaner 5.14 upgrade and it won't let me. It says that a file could not be installed. I have never had any problems doing Ccleaner upgrade installs in the past with Windows XP or 7. Any hints on this ?