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I finally got nytopo 11 loaded into my garmin.  I downloaded the file again and this time I created a folder called "garmin" and did the .exe into that folder.  BaseCamp immediately saw it as one of the drop down maps.  Not sure why it would make any difference what folder it is unzipped to.  All the other times it unzipped into the folder "program files x86" as nytopo 11.  Oh well.  Just have to accept it as it is.  Oh, and I also downloaded and installed on my Garmin a huge map I think called US Northeast.  Huge file, over 500 megs or so.  Worked just fine.
But I appreciated all your replies and help.

Hmmm, just another interesting thing here.  I downloaded a "trails" map from this site and it showed up in the BaseCamp map drop down list. Maybe someone out there could try installing the nytopo 11 map and see if there are problems with it.

I'm running Windows 8.1 32 bit.  No, there are no more drop down maps.  The only map that appears is the one I posted, just a crude base map.  Something is not right when I run the .exe from the NYTOPO 11 download.  It places the files in the folder "Program Files x86 and they are all under 3 megs and are all windows media player files along with an uninstaller.exe.  That can't be right.  I would expect some really large files like 100 or 200 megs worth.

Here are larger images of the previous ones.
Oh, and by the way, the map I was able to install was from http://garmin.openstreetmap.nl/

Thanks for your replies.
Here are some pics of what I've done: 

I downloaded the NYTOPO from this site and ran the .exe and let it install itself.
I also let it install itself as it downloaded.  BaseCamp still could not see the map.

Interestingly enough, I was able to download and install a map from another site.  Not a great map but many times better than the base map the Oregon 450 came with.

Thanks for the reply.  I've tried everything you indicated, but both BaseCamp and MapSource insist the files are not recognizable.  I now have to assume that perhaps the New York topo maps I downloaded are corrupt.  I've spent many hours trying to get things to work, never saw anything so convoluted as this.  I'll try a different map.  If that doesn't work I'll just simply take the Oregon 450 back for a refund.  Besides, why pay hundreds of dollars for a device that have maps on them that remind me of the simple graphics from a 1980's video game.  Sorry for the rant, but I could be out in the fresh air walking a trail instead of sitting in front of my computer for the last few days.  I've been in computers for 30 years and never experienced anything this difficult to manage.

Hi everyone.  I'm new to this site and new to attempting to install maps on my Oregon 450.
I've been at it for hours with no luck.
I downloaded a New York State topo from GPSfiledepo.  It was an editor's choice pick.  This map download has an installer included so I installed it on my PC with no issues.  However, when I try to open up these files in BaseCamp or MapSource it says these files are not valid files and can not be opened.
What am I doing wrong?
Thanks for any help.