I downloaded the latest version today as a trial. Started the health check scan and it gets to about 40% and never gets past that point. After 2-3 hours I selected to cancel and it too hangs. Rebooted the PC and tried again with same results.
If CCleaner is hung then you can usually close it by using the 'X' at the top right of the CCleaner window.
(You could also open Task Manager, right-click on ccleaner there and 'End Task').
That should save you having to do a restart.
Is this CCleaner Free version or the Pro version trial?
Which one it is could help point to why it is hanging for you.
Also please tell us what version of Windows you have, and if you are using an Ativirus other than Windows Security then what that AV is and what version it is.
To try and work out what may be happening and so fiix it for you:-
Firstly try running an 'Analyze' in Custom Clean instead of using Health Check.
If the Analyze completes then click 'Run CCleaner'.
If Custom Clean also hangs then please post a screenshot of it in the hung state.
If Custom Clean runs OK, and if you have the CCleaner Pro trial, then try disconnecting from the Internet before running Health Check.
If Health Check runs without the internet connection then that will help point to the issue.
Let us know how those go and we can advise what to do next.