You get it from the Garmin website, here is the relevant page : Garmin | Mapping Programs
So long as you have a Garmin map product installed on your PC the download will install & work OK. So if you havn't already, then install your maps onto your PC.
There may be a version of Mapsource that came with your GPS device or the maps you purchased, but the latest one on the Garmin website is the best one to use. For example Mapsource was updated in April 2009.
Hope this helps,
Jon


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