I never selected the entire continental US. I did the entire east coast and some of the mid US. Try selecting a smaller area to test or break the areas up that you want to transfer. Also, make sure that you use the correct registry file for mapsource for either XP or Vista. That may cause an error if not done.
“ Originally Posted by MarkAtHome 
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I am never prompted for a Map ID code, so I can not enter 243 in this field. After getting my GM XT unlock code, etc., I select the map product City Navigator North America NT 2008, but no window opens. I only have the option to generate a key. FWIW, I am using keygen v1.3.
Update: I was choosing the complete North America map product and didn't select custom. Will try again. Thanks.
2nd Update: Not mentioned was whether to register the product -- in all cases, I opted not to. Anyway, I selected the lower portion of Canada and all of the continental U.S., clicked on the send to device button, and received an error, asking that I copy the log and send it to Garmin (which I didn't). The log is attached.