The IDWedgeBT Keyboard Application Updater requires a special programming cable, and a PC with a serial port, or a USB->Serial adapter. The application has on screen instructions on how to perform the update.
The quick guide contains screen shots of the procedure, along with information on the recommended USB->Serial adapter.
Download the archive below and extract to a directory on your PC, there is no installation process, simply run the application from the directory you extracted the archive into and use the special programming cable.
The IDWedgeBT Keyboard users manual, with revision history: