OK, first of all the Best map for your area is something you need to work out, as per some areas the Navteq map is better, some areas the Sensis map is better. They both have errors. (man made).
I don't think Garmin will be updating the Sensis map for long due to their deal with Navteq. Just my opinion.
Secondly the Sensis 13.20 map is the same as Sensis 13.10 Map. has same FID.
Thirdly if the download you did, after unpacking the .rar file/s, doesn't have the image file in it of 199MB in size then it is probably the MapSourse Install package which means you need to click on the .msi file in the downloads unpacked folder & it will install in MapSource if you have that installed. Then you can use MapSource to compile an image to your device (this will erase your previous map), or compile it to an SD Card & transfer the image anywhere you like.
I have found that running 2 City nav maps of the same area on the GPS works sometimes & some times not, depends how your device gives priority to the maps.
Hope that helps.
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