[CCleaner just not starting...]

I currently dont have a licence...just wanted to test CCleaner, but it just wont start on my Mac Mini with the newest MAC Os (no other Updates available).

Any suggestions? I want it to work, before i buy it :)

[CCleaner expires today? 3 months before !]

@Dave CCleaner Thanks for your Reply. Soon after my post everything was good again. "License Information" was empty when i posted my comment, but soon after that it went back to normal and now its showing everything (expiration date etc.) again. And i do no longer get a popup reminding me that my subscription is about to run out. 

The fault wasnt cleary on my side...i copy and pasted the serial from an email i got, when i purchased it and it worked perfectly fine until a few days ago.

[CCleaner expires today? 3 months before !]

I bought it (pro version) in july this year and today it expired, wtf?

And i had to create a new account here...my old accound could not be found.

I paid with paypal, so it should not be a problem getting my money back.