Recent Bluecharts come as .img and can be unlocked easily by [Only registered and activated users can see links. ] No virus in our forum
Every MS or Basecamp Map installation can be unlocked by [Only registered and activated users can see links. ]
If antivirus gives you a warning, it's a false alarm. Old GU is obsolete now, forget it.
Take a look at:
[Only registered and activated users can see links. ]
Scroll and you'll find info and links about everything for Garmin maps and more.
Or [Only registered and activated users can see links. ]
Just use browser find to search.

Edit: you should update your maps
[Only registered and activated users can see links. ]