I've been running the free version of CCleaner on a WIndows 11 PC for more than a year. Today I attempted to upgrade to the Pro version. I completed all the credit card details, but have no idea how CCleaner knows who I am. I wasn't asked for an email address. In the 'My Account' (top right) on the CCleaner app there's no indication that CCleaner does either. I can't see how I can create a personal account.
How do I upgrade?