DP900 Wireless Drag system
Download USB driver (cp2104) required to communicate with wireless box
This zip file contains a lot of stuff as shown below and can be confusing, please just run 
Trackmate Time Slip Printer How to Install
Auto Pairing of Racers
this is a paid option
Youtube Video on how to use the Bracket which is for auto pairing of racers
This is an add-on, You should also watch video to see how names and cars are added.