cc Pro cleaner won't let me activate it

Hi Guys , I purchased CC pro Cleaner in november , 2020, i have been trying to activate ever since that day, all i get is a activate box come up on screen when i try to run the program, I have copied and paste the number i was given in the email when i purchased it, when i try to activate it still shows as a free copy and ask me to upgrade which i have already paid for,

I have tried to uninstall and reinstall no luck, I have tried the link that was in the email also still unable to activate , I did not have any problems with all the previous version's that i have used before

Any help on this please

Download the 'Slim' installer from here and use it to install v5.76:

https://www.piriform.com/ccleaner/builds

That will be the latest Free version, so go to Options>About and click on 'Upgrade to Pro'.

Enter your key and the registered name from your confirmation email and click on 'Register'.

This gives more info about registering and how to deal with common registration problems:

https://support.piriform.com/hc/en-us/articles/204043844–Problems-activating-or-registering-CCleaner-Professional

Thanks very much nukecad all working ok now ?