Thanks to Mapperoni and catymag. It took a while to find the appropriate tutorial sections and I had 36 hr filled with other projects (grandchildren included). Finally got the img file uploaded to the Garmin in time for someone who is flying to Barcelona and Pyrenees today.
Another question: With MapSource it is possible to select the map portions required and load only them to the Garmin. I did not need all of Spain so should I have selected the MapSource files instead of Topo Hispania v2.03 for MicroSD (GPS Garmin) by SinRenKor?
Thank you again.