There are apparently two or more Registry locations controlling Monitoring. Unchecking Options | Monitoring | Enable System Monitoring does not set HKEY_CURRENT_USER\Software\Piriform\CCleaner\Monitoring to zero, but manually using Regedit (or a script) to set that value to zero works as desired: CCleaner closes completely and is no longer running as a background process nor iconized to the taskbar.
An entry for HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\CCleaner Monitoring pointing to the CCleaner application also must be manually removed.
Note there is also a value for HKEY_CURRENT_USER\Software\Piriform\CCleaner\SystemMonitoring which is set to zero.
Caveat Hacker: Registry changes can be dangerous... it is a good idea to back up your PC before making changes.
CCleaner 4.18.4842 remains in taskbar!
in CCleaner Bug Reporting
Posted
There are apparently two or more Registry locations controlling Monitoring. Unchecking Options | Monitoring | Enable System Monitoring does not set HKEY_CURRENT_USER\Software\Piriform\CCleaner\Monitoring to zero, but manually using Regedit (or a script) to set that value to zero works as desired: CCleaner closes completely and is no longer running as a background process nor iconized to the taskbar.
An entry for HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\CCleaner Monitoring pointing to the CCleaner application also must be manually removed.
Note there is also a value for HKEY_CURRENT_USER\Software\Piriform\CCleaner\SystemMonitoring which is set to zero.
Caveat Hacker: Registry changes can be dangerous... it is a good idea to back up your PC before making changes.