Lob Jobba, I would call support immediately to tell them of your purchase of a map through HOME but are not able to download them due to the error message you are getting.
The problem with buying maps through HOME is what you arleady mentioned, that it doesn't show the version number of the map. I must admit, I haven't gone through the entire process of purchasing a map but the steps I followed never showed me the version number.
I believe the latest version of North America map is 6.75. Check the version you have, and make sure when you call that you know what version you are purchasing to be sure you aren't buying something you already have.
The problem with buying maps through HOME is what you arleady mentioned, that it doesn't show the version number of the map. I must admit, I haven't gone through the entire process of purchasing a map but the steps I followed never showed me the version number.
I believe the latest version of North America map is 6.75. Check the version you have, and make sure when you call that you know what version you are purchasing to be sure you aren't buying something you already have.