Clicking on the about page will show you your current Licence information along with a form to let you upload a new licence file. To upload a license you will first need a license file (license.lic). Click the "Browse..." button and locate the license file. Once entered, click the "Upload New License File" button to update FusionReactor. To complete your license install, click on the link which says "Click on this link to activate the current license" and FusionReactor will attempt to activate your license automatically. If you do not have a direct internet connection then just follow the instructions given to you on the page.
At the bottom of the About page you will see a link named "check for FusionReactor updates". When you click on this link you will be taken to the FusionReactor website. If there are any updates available for your version of FusionReactor then you will be given links to download them.