“ Originally Posted by scottierojo11 
”
After I click on the part 1 it combines the files but not into an .iso file but a .zip file. which reads Garmin Mapsource City Navigator North America NT 2009 Update.zip..
Can I mount this with poweriso or can i only mount .iso files?
if you see a folder in the zip, then click and drag it to the desktop (or elsewhere) to extract it, then go to the folder/windows/msi/ and run the _ENU one...then just follow the rest of the directions found in the OP.
on the other hand, if you see an iso in the zip, then you will need an application like poweriso to mount the image.