Magellan hand held GPS 320 software update

[Auntie Podes]

When my faithful Magellan hand held GPS 320 was carelessly dropped, it packed a sad and refused to work. So I bought a 2nd hand one which works fine but needs updating to the latest s/w version 3.15. As it is old, Magellan have lost interest.
Does anybody have a copy of this update I could have, please.
Photo of model attached to avoid any confusion.
Aunti Podes
B of I,
NZ