Thanks for replying.Your map (665) is very out of date. Newer maps are 725 and 815(I think you can use the latter with 7.90 only)
The reason given for application 7.90 was to allow older units to use the 815 maps.
Log on to Home, and go to "Add maps, Traffic, etc."/Maps - and see if it offers you the 815 Map. If it does not appear (you should also be logged onto your TT account), call TT support and see if there any issues.
I would be careful here - many posters have been having trouble with the new applications (8.3 and 7.9), and have rolled back to older applications. In both cases, this makes it impossible to run the 815 Maps, which will not run on the older applications.
If you are not having any trouble with 7.9 - you may be OK. I would first give it a good test on the road and also when using any of the features you want to be sure work OK.
The installation of a new map will probably not cause problems by itself. Make a copy of your map folder for safe keeping first (with windows - use windows explorer and make sure that in "files", you set it to show hidden files and folders first).
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