There was a bug in the November 9th 5.74.8184 release of CCleaner for Windows that automatically linked the Automatic Updates function to the Smart Cleaning feature. Although having both of these on is an optimal configuration, it was not intended that Smart Cleaning be switched on where it had previously been deactivated by the user.
We are currently working on a patch release to remedy this, and we expect it to be available shortly.
In the meantime, although CCleaner recommends that you leave the Smart Cleaning feature on, if you wish to switch it back off you should be able to do so by going to Options > Smart Cleaning and unchecking all of the boxes.
In a small percentage of situations, this setting change may not remain persistent between CCleaner restarts. If this is the case for you, we recommend that you also go to Options > Updates and also switch off automatic updates temporarily until the patch version is released.