You didn't look hard enough, or at the wrong bits & pieces, my fine feathered friend .
You need to have the full EU map installed. Unfortunately you've got Buckley's chance of it fitting on your 3790's [so called] 2 GB memory as you'd know, even without the ancillary files. So put it on a 4GB or larger microSD and problem solved.
I've moved your post to the existing thread on this problem. Read Post #1 and this Garmin article:
This is the relevant text:Code:Please Login or Register to see the links
".......... you may have loaded only a region of mapping to your device during a map update. Please run the map update again and choose full coverage for your continent. For example, if your device was preloaded with Europe, you'll need to install Full Coverage of Europe."