It Worked ! Thank You Very Much !!
I just downloaded the new "My Trail", and used the BaseCamp/MapInstall app as before and it installed just fine.
For what it is worth, earlier before downloading the new version of "My Trail" I did try MapSource with the "My Trails" which was failing with BaseCamp, and it worked fine as well.
Thanks again for all the responses, and of course the ultimate fix.
I just downloaded the new "My Trail", and used the BaseCamp/MapInstall app as before and it installed just fine.
For what it is worth, earlier before downloading the new version of "My Trail" I did try MapSource with the "My Trails" which was failing with BaseCamp, and it worked fine as well.
Thanks again for all the responses, and of course the ultimate fix.