|I hope you are trying the trial version and you didn't buy it yet.|
You can accomplish the same thing using Ccleaner Slim for free. Ccleaner has a registry module but there is usually no reason to use any registry cleaner. The strength of Ccleaner is in the cleaner module. Get it at the link below.
If you still wish to use that program then go to the link below and click on support at the bottom of the page.