DJM-250MK2

I had a DJM 909 and changed it for a DJM 250MK2 ? I am very heavily disabled and having difficulty setting it up to my Macbook Pro using Traktor Pro 3 ? I thought that it would be straight forward to exchange the wiring from my DJM 909 setup. I have absolutely no idea how to get and install the free Recordbox software with my mixer ? I am wanting to try get it to work properly with Traktor 1st. Can someone send me a very descriptive setup procedure with pictures so my carer can wire it up properly ? Failing that can someone tell me how I get reckordbox ?