I purchased a USB transmitter and I lost the registration key that came with the unit. I can't proceed with the software for the USB transmitter without the registration key that came with the device.

Please download the latest version of the ScreenBeam Wireless Display Software from the Actiontec web site. The requirement for the registration key entry has been removed and the latest version will help ensure you are running the most stable version available.

The ScreenBeam Wireless Display Software can be obtained “here”.