This way all settings, your collection, and your playlists remain unchanged. Number with the one you got for Traktor Scratch Pro 2. You bought the upgrade, use the NI Service Center to replace your current serial Traktor Pro 2 and Traktor Scratch Pro 2 'live' in the same executable file. If you own Traktor Pro 2 and want to upgrade to Traktor Scratch Pro 2, you do not
How To: Upgrade from Traktor Pro 2 to Traktor Scratch Pro 2