What I didn’t realize is that the old file had contained information that would put the map image into different languages. But, before I did that I deleted the old files (before deleting I had saved a copy onto my computer).
On my MAC it downloads as an image and not as a zip file so it is easy to place in the folder this might be different on a PC.
We are forever indebted to him for showing us how to do this. A friend taught us how to download free maps to our GPS when we were in Mexico. We use open source maps downloaded to our Garmin GPS.