Buongiorno
La mia vecchia email non funziona , devo contattare CCleaner per la sostituzione
CCleaner is not an email service.
Do you mean that you need to change the email that you have registered you CCleaner subscription with?
If so then use this form to tell them both the old email and what you now want it changed to:
https://support.ccleaner.com/s/contact-form?language=en_US&form=general