@jynie,

Go to:
Menu
i <----info
5th item down map version 15464

Now as to where the maps are:

On my SD Card:

Android\data\com.tomtom.gplay.navapp.nds\files\NdsMaps\World\Data\00000028\<-------all the different maps you downloaded

Now I have it installed on Android v6
It could be different for 7,8, or 9

Maybe some one with these versions of Android can check and post their info too.