Can't register Ccleaner key

[LionelNZ]

Trying to register on Windows 11 and is not allowing me to.

Cannot contact Piriform to find out why!!!!!!!

[nukecad]

Are you copy/pasting the key from your purchase confirmation email?
People do make mistakes when typing them in manually. (eg. S instead of 5, I rather than 1, etc).

Are you using the name that you registered? It has to be exactly that registered name.
(People have also been know to make typos with their own name when registering it, check what it is on the purchase email).

If you don't have the purchase confirmation email anymore then you can lookup your key and registered name here: https://www.ccleaner.com/support/license-lookup

This is the guide on registering your name and key: https://support.ccleaner.com/s/article/how-to-register-and-activate-ccleaner-professional?language=en_US

If you are still having problems after going through the guidance then you can raise a ticket with support using the form here: https://support.ccleaner.com/s/contact-form?language=en_US&form=general
Give the email that you used when purchasing, that identifies you as a paying customer.
Make a note of the ticket number when it is on screen.
You will also be sent an automatic acknowledment  email but it doesn't have the ticket number.

Alternatively you can email them at support@ccleaner.com
You should use the same email that you used when purchasing, again for identification.
In that case you won't get a ticket number, but will still get an automatic acknowledgement.

In either case you will then be in the support queue and will get an email from a person, often that will be within hours but don't always expect a quick reply - sometimes if they are very busy with many earlier requests/tickets it can take a few days to get to yours.