Ive been sent the link to dwonload the map. I click on the file to download it. It goes into my downloads folder and then when I click on the zip file it extracts
the file but i get a message that reads.....
What map did you attempt to download? I am not aware of any way to download the entire North America map from one link on that web site.
I suggest you follow Pat's recommendation to download one state at a time. Remember to rename each IMG file by state name, sequence number, or something else, so you have 10 unique files. Or download the entire 4GB file (currently, the latest is at 4000MB-lon_-170.97_to_-74.05.2017-02-25.gmapsupp.img
What device do you have? Most Garmin devices allow for a micro SD card that can easily store 4GB & 8GB files.
Store the file under the "Garmin" folder on your device. On an SD card, create a new folder with the name "Garmin", then store the map in that folder.