It is not a problem, but make a note of your licence key before removing CCleaner from the old machine. Open your current CCleaner Pro and go to Options>License Key - make a note of the key. When you have the new machine up and running download the current CCleaner installer onto it from here: https://www.ccleaner.com/ccleaner/builds Double click the downloaded installer and it will install CCleaner Free. Open CCleaner Free and go to Options>License Key. Select