Registry Booster disappeared from my PowerSuite. I have tried to repair it by downloading it again, but that does not work.
If you want to install Registry Booster you can go to the official website, which provides the URL for the latest package. The problem with your software is that is has bugs and updating it may overcome those bugs (Registry Booster included).
If you can't access the website you can use the direct download URL: http://download.uniblue.com/support/rb/latest/registrybooster.exe