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[No Garmin maps found]

I'm trying to load my first new map onto a Nuvi 500. I read Rex's tutorial on loading maps http://tinyurl.com/cxh49l but can't get past step 3. With my Kingston 4gb microSD card in a reader and mounted on the desktop, I launch MapInstall. Instead of the splashscreen Rex describes, I get the following error: No Garmin maps found

I get the same error with the card installed in the Nuvi and the Nuvi mounted on the Mac (OS 10.5.4). The file is named "California Topo.gmapi" and is one by Laura Sanborn that I found here on GPSFileDepot.

Any help greatly appreciated.

banjr