Update your NC to 7.903, with NC 6.525 you can't use the current maps. You can activate the Europe_970_7468 about the Europe-100780.meta of the Europe_970_7490 ([Only registered and activated users can see links. ]). The download of the needed Europe-100780.meta you can find in #2 of the link.
P.S. a high-level-map 970_7466 doesn't run on your "low-level-device". These maps are running only under NC 9.0xx and above!