Copy the tomtom folder to the SD, install the APK, enjoy.
If you need more than one map to work with:
Download the archives for the areas you need.
Install the APK and copy the content folder to the SD - like a normal single install.
From the other archives you copy the map folder(s) into the folder "tomtom\com.tomtom.italia\files" - you will see the first map folder there for confirmation that you are in the right place.
When done the TT APK will still only use the first installed map!
To change between maps download the TT map changer : [Please Register or Login to download file] - now the 1.1 version for all TT APK's, Created by our Fatboyfun, so all credits to him!
Install the APK, start the MapChanger and TT will ask you what map to use.
All settings for the map(s) will remain untouched, so I think it is a pretty good tool to have
[Please Register or Login to download file] - with additional POI's
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[Please Register or Login to download file] , this is the complete, big, Europe map
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More to come as my line allows and meta codes are available.