Make sure you select
Custom Map Set. I've never used Mapsource until I downloaded it. Play around with it and you'll get it working exactly the way you want.
“ Originally Posted by MarkAtHome 
”
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.