I upgraded my free version to pro plus and as soon as I add the license key I got the error message, Your License Key Doesn’t Exist. I have sent this to customer support and replied to the automated email I received without realizing it was going to take longer than the 24 to 48 hours like the email said, especially responding to the message. I read the same error message was given to someone else in another post here but nothing has worked in my case. I have tried everything so I am just going to have to wait for someone to get back to me. I have used CCleaner for many years and have never had an issue. I sent my reference number and the details. My account says active but the key will not wok.
I will forward this to the admins.