During the ImageGear for Silverlight installation, you need to obtain a license key using the Accusoft License Manager that is run automatically at the end of the installation. If you need to run it manually in the future you can do it using the following shortcut:

Start Menu\Programs\Accusoft\ImageGear for Silverlight\License Manager  

The License Manager utility requires an Internet connection in order to manage Development license keys. However, Evaluation license key registration does not require an internet connetion. If you don't have an internet connection, please contact Accusoft Customer Service at http://www.accusoft.com/imaging-support.htm.