@catymag
Many thanks for your prompt reply and advise on not to rename the files.
It wasn't necessary, part 5 (last part) had a .zip extension so I clicked on that one and winrar took care of it. Too bad it doesn't work in eiither of my Nuvi's, a 670 and a 680.
Since it exceeded the 2 gig limit the units won't recognize them. I can always try to rename it gmapprom1 and put it on the 670 snce it has 4 gig internal memory. I still think the results will fail since I'm certain the 2 gig limit applies to internal memory as well. I suspected it wouldn't work since Garmin site shows neither the 670 or 680 as being compatible with 2011.40. But it didn't hurt to try.