In the current CCleaner 5.45 version of Piriform/Avast, it is difficult to disable active monitoring. This caused angry public reactions about the malfunction of the’Active Monitoring’ function. Even if you try to disable it via CCleaner Settings > Monitoring, it will start monitoring again on restart.
Active Monitoring allows CCleaner Free to monitor your installation for updates or new versions in the background, so you don’t have to worry about staying up to date. If you prefer CCleaner not to monitor your system, you can disable active monitoring by following the steps above.