latest map guarntee

[eskortzx2]

so im trying to update my 3rd edition and for some reason it wont install the new map overtop of my old one. its telling me i need to remove 902.7mb before i can continue? so what do i do here?? i think i might just call tom tom customer service

 

[Pedro2NR]

I've updated maps for a friend with their ONE LE. the new maps went over the old ones. I've heard TT Support recommend to first delete the old map so the new maps can be installed.
Which ever method you do, always make a backup.