vox_de_hg
I think I know why your install is not working, the files you have downloaded (BMW Road Map Premium Europe West 2018-1.7z) is for the 3 USB setup. To confirm this is the case look at the files I suspect it is split up into 3 folders USB1 USB2 USB3 intended for 3 DVD or 3 individual USB installations.
I used a different single USB install. Try Download BMW ROAD MAP EUROPE WEST 2018-1 as zipped up in the original post :-
http://www.e90post.com/forums/attach...6&d=1517407334
E90M3DE
Unfortunately I think no checkmark means your Navigation is not suitable for USB installation only by DVD's. Your CIC unit will require a firmware update first to enable USB installation, this firmware update can be performed by your dealer. I suspect they will charge you for this.
Hope this helps you guys