Map update fails after NavcoreV4 update

MaverickScot Registered Users Posts: 6
Master Explorer
edited December 2020 in Map purchase & installation

I received a Tomtom update email and updated my GO500. I was informed that the navcoreV4 had to be installed first before the maps. This updated fine but when I went to install the maps it keeps failing. I do have a 32gb SD card in the unit for the map so I have enough space.
So far I have tried:-
Repairing the corrupted map.
Deleting the map and reinstalling.
Uninstalling and reinstalling the core PC programme (Name escapes me) as well as removing the temp data as described in a Tomtom video.

Can anyone help as I use this daily and being without it is like losing an arm.