Just to answer my original question for others, once I sorted out the issue above I was able to install the map to the internal memory - the name of the img file does not seem to make any difference. One can select it and enable it in the map setup screen.
I am having the same problem on a mac, I cannot unlock the map because the gimgunlock is still "skipping" files.
Screenshot [Only registered and activated users can see links. ]
I have tried on windows also with the same issue
Maybe the img is corrupted ?
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