tt truck upgrade to v920

hi ,
im just downloading europe truck 3892073trk.part01.rar and will download all of them.
my tt is tt go 7000 truck with an old europe truc v850 on it and im running nav app 9.701 which ive checked on the the maps chart and this is fine.
the map already on it is genuine do the navi app has never been patched, so i understand ill need to download the fastactivate app to patch the map and navi app.
ive done a ful backup of my tt (including hidden files) I realise that the tt wont have enoufh room for both the original truck map and the new one im download to install onto it.
So which files can I delete to make room for the new updated europe truck v920?
Ive noticed a europe truck folder and a map folder with a file in it on the root directory of the tt.

anyhelp would be greatly appreiciated

many thanks

Leroyy

Delete the EU truck folder and replace with the new map, activate and patch with the latest FastActivate.