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I tried double-clicking the installer again, but I had already successfully installed once. I still get the light gray, unreadable file as before. Can I really download an unreadable file to the GPS? It' counterintuitive, but I'll give it a go.

See the tutorial: http://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/

I downloaded a Texas topo (mti_tx.tar) successfully onto my Mac today. When I clicked "import" in  Garmin BasCamp, it showed a gray file in my hard drive as mti_tx_gmapi. I cannot select the file for import. Neither can I open the file outside Basecamp. How can I open and or import the file?