First: I'd suggest to download a newer Bluechart, yours is too old:
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Second: use this to unlock it
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Third: Homeport is the right program to display BC on pc
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don't use MS or Basecamp.
Fourth: put in sd/Garmin/gmapsupp.img (only one gmapsupp.img per sd) and ,after using gimgunlock, don't add the .unl file


Edit: to see the complete Gmaptool log click on Details button
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