I have a license for CCLeaner Professional that expires in May of 2021. Despite the fact that it's June 2020, it prompts me to renew my expired license several times a day. How do I make this stop?
Did you purchase a new licence at some point (or take an update when you renewed) and get a new licence key? And, if so, is that key the one that you are using? (You can see all of your licence information with expiry dates, etc at https://www.ccleaner.com/support/license-lookup)
What expiry date is displayed in Options > About > License Information?