« CleanMyMac X.app »

Uninstalling the "CleanMyMac" product requires using it to uninstall itself. Since you are unable to launch it, you are now in an untenable situation.

Please restart your Mac in "Safe Mode": Use safe mode to isolate issues with your Mac. Then, drag the app icon to the Trash.

Then, restart your Mac normally.

If you encounter any problems, possibly in the form of a dialog related to "CleanMyMac", please describe it.

Google translation:

Cannot open "CleanMyMac X.app" application because it may be damaged or incomplete.

Consider yourself lucky. It's considered by most experienced users here to be akin to malware. There is no reason to ever install or run any 3rd party "cleaning", "optimizing", "speed-up", anti-virus or security apps on your Mac.  This user tip describes what you need to know and do to protect your Mac: Effective defenses against malware and other threats - Apple Community   

Delete the app and don't use any similar apps in the future.

Vuleriate raccomandà di scaccià ogni parte di i file pf ot & macpaw è di trasfurmalli ...

Disinstalla CleanMyMac per e so indicazioni, poi eseguite etrecheck di novu per vede chì paglia lasciava ...

In CMM ...

https://discussions.apple.com/thread/251370955?answerId=252661013022#252661013022

https://discussions.apple.com/thread/251442443?answerId=252814053022#252814053022

https://discussions.apple.com/thread/251464557?answerId=252841819022#252841819022

Well, you have posted in the US forums, so i will answer in English with a french translation following:

You do not want to install that application. It does nothing you need and can "clean" so well that it will cause problems with your OS.

Eh bien, vous avez posté sur les forums américains, je vais donc répondre en anglais avec une traduction française suivante:

Vous ne souhaitez pas installer cette application. Il ne fait rien dont vous avez besoin et peut "nettoyer" si bien qu'il causera des problèmes avec votre système d'exploitation.

You want to uninstall it. It is of no use. Check the developer website for instructions.

If CMM have never been run it won't have installed any of its supporting files so deleting the unused app should be sufficient in this case.