license message continually pops-up

I have purchased and downloaded the latest relase of CCleaner. The programme seems to run properly. The home page does not show me as 'unregistered' but every time i open my computer a message comes up telling me that the licence is expired. How do I stop that happening?

@Willmol: Have you entered your new serial number (starting with P4UB) into CCleaner?

Options > About > License Information

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If this doesn't do the trick then there may be something amiss with your account - in which case the good folks at support@ccleaner.com will be able to sort you out.