Here are the links for the cable and the 20 pin adapter. Most e53 owners will not need the 20 pin adapter as you can acess all modules through the obd port on 2001 and up. Do not install the drivers if they come with them. I will start a new thread on complete installation for edibas, INPA, ncs, and ISTA, tonight. In the mean time you can purchase the cables.

VAG com USB Cable OBD II 2 FTDI KKL 409 1 VW Audi VCDS KTM Triumph Tuneecu BMW | eBay

New 20 Pin to OBD2 OBD 2 Female 16pin Connector Adapter Cable for BMW Oy | eBay