Was just wondering, I have Garmin Topo 3.02 downloaded on my computers hard drive, using instructions I found on this forum. I access the map sheets through Mapsource. If I purchase Topo 2008, Can I download it in the same fashion, or do I need to delete the files from 3.02 before installing the 2008 version? Would I want both versions on the computer ? I would appreciate any advice !