I signed up and have been using for 2 weeks. I bought pro, but I keep getting warnings that my free is about to expire, even though I received pro and have entered the codes? It's acting like I haven't purchased anything.
What does it say at the top of your CCleaner?
If it says 'CCleaner Professional' then does it also say '(unregistered)' after the version number?
We do see a few cases where people type their key (or name) in wrongly so it doesn't register, see this for advice: