These are screenshots from every step of the wizard. 

See if you apply to the minimum requirements and read the disclaimer

Start Mapsource and select the maps that you want to upload to your GPS. Doesn't need to be just Metroguide maps, you can also include for example extra TOPO maps. Save the mapset.

Go back to the wizard and load the mapset you just saved in Mapsource.

Have Mapsource generate an index file, all it takes is a click of the mouse. The wizard will automatically keep the index file for uploading to your GPS later.

We are ready to upload the maps to your GPS. Choose what you want to do next: upload maps to your GPS unit and/or save them in a seperate IMG file (GMAPSUPP.IMG compatible) for upload later.

The wizard will upload the maps to your GPS and/or save them in a GMAPSUPP.IMG compatible file.