My web browser says “phrem” is not associated with any known application. What should I do?

Products in the Propellerhead Shop are downloaded through a utility Application called Authorizer. Authorizer is installed on your computer the first time you run Reason version 6.5 or Reason Essentials version 1.5. If your web browser does not launch Authorizer for you when attempting to download, launch Reason or Reason Essentials once to install Authorizer, then attempt the download again.