@David > Ok well, first off, lose the USB cable. We're going to be working with CAT5 / 6 cables here (i.e. LAN cables).
You connect one LAN cable from CDJ 1 to DJM2000.
You connect one LAN cable from CDJ 2 to DJM2000.
You connect one LAN cable from DJM2000 to your laptop.
All the LAN ports are clearly marked on the back of the mixer.
Ensure you have both your players and mixer updated to the latest firmware. Ensure you allow Rekordbox traffic through any firewalls so you can connect you properly. Everything will talk to each other in this configuration.
What problems are you having with the Rekordbox download?