If I understand correctly, you use CleanMyMacX on your machine and on another computer as well? Are you buying separate copies, or is there some kind of free one-time use for another computer available?
And thanks for your comments. I have used CleanMyMacX without a problem, as a part of the SetApp selection of apps. After years of many OS X (and macOS) updates in my first Mac, then a replacement, my computer seemed slower that it had been previously - especially the Mail app. I did a backup, then used CleanMyMacX. The result was noticeable - faster general operation, faster app launches, faster Mail app, and more free disk space.
I was leery of using any of these Mac "cleanup" apps. The app MacKeeper, for example has a terrible reputation and is junk and probably malware/adware, in my opinion. I have seen firsthand the mess it made in a friend's Mac. Could some of those who posted comments above be confusing MacKeeper with the more reputable CleanMyMacX? I tried CleanMyMacX only after seeing recommendations from trusted sources (I think one of the sources was the podcast Mac Power Users).
I can also recommend the app Appcleaner from Freemacsoft. It is a simple, small-footprint app used for deleting apps and their accompanying "helper" files scattered about your Mac.
I have no relationship with CleanMyMacX or Appcleaner developers, or any app developers. I'm just a satisfied user and want to clear up some conflicting information.