I can confirm that this works, provided you're able to get all of the RAR files downloaded, reassemble them and burn them to DVD with the data intact (MD5 hashes are included to check):
http://gpsunderground.com/forum/renault-nissan-infiniti/19922-nissan-infiniti-connect-premium-x9-europe-2012-a.html
Note: this is only legal if you already have a licence and need to restore your image. You mustn't at all do this because you're a crazy person that thinks charging €399 for map upgrades is madness and want an alternative to your car telling you that there are still roundabouts on the A1...
If anyone is having trouble legally restoring their discs, PM me for more details. No crazy people please, heven forefend.