The guy who did my installation knew that this step was unnecesary and didnt bother.
If you show that you can connect without the BT DVD then everything should be fine.
I had got a reasonaly long ethernet cable so my daughter could connect to the HH3 without using wireless (I was at work) and the BT DVD is still in the box.
When I got home then HH3 went back in the box to join other ISP supplied routers in the garage and my Billion 7800N is now providing much better Wireless connectivity and handles to full speed 80/20 connectivity without problems.
Using wireless speedtest.net gets 71Mb/s down and 16Mb/s up!
BT Infinity 2 - IP profile 77 / 20 - super fast!
Previously BE Unlimited - 21,000 Download 1,200 Upload but then moved house - 6,500 Down, 1Mb/s up - gutted!
Ex <n>ildram , been to SKY MAX - 15,225 Download