Not sure what this has to do with the topic, but CustomLocation is only for chrome, firefox, opera. If you have further questions, please start a new thread instead of posting in someone else's
Since you're a paid user, don't forget you can get priority support from the developers.
That said, many people have had this difficulty lately. Are you saying that with ccleaner uninstalled you are still getting the cannot overwrite error? If you navigate to c:\program Files\ccleaner (or where your ccleaner is if you customized the install path) and confirm there are no files in there.
As trim and community winapp2 are not officially supported, we ask that you ask this question in the dedicated winapp2 thread https://forum.piriform.com/index.php?showtopic=32310
That I am unsure of, the video shows the second ccleaner process popping up after the 10 minutes..but with monitor running (as it is in the video) it could possibly run from there (note I don't know that to be true but roughly guessed by the evidence that you have as well)
@robertcarroll6, @pearshaped please take some time to read the posts and watch the video that @hazelnut posted https://forum.piriform.com/index.php?showtopic=48869&page=10&&do=findComment&comment=286894
Juat so you know, moderators are speaking with Admins (Piriform employees) on this topic.
In your browser can you provide us with the exact steps you followed to see each separate certificate? I know that's a weird ask but it's what was asked of us.