Hello to all!

I just bought a C8 from 2003 and wanted to use a diagnostic software and found this page.
I read hopefully everything well but there came up different questions:
1. I installed CD44 and it seems to work without activation (I changed registry key according to information on first page). The program is starting but it has a problem to find a diagnostic tool at the USB-port and therefore it is not starting the desktop of the software and the software is closing the session. (I used a ELM-CAN Bluetooth device)
2. Do I have to activate the software or is it already activated after adding the key "firstInstall=1" ? And in which way I can make updates (which button or icon)
3. Which cable or diagnostic tool is working? (I foud on ebay for example this: Lexia-3 Lexia Citroen Peugeot diagnotic tool (5 cables) from China.
4. If you have links where I can find all the information I would appreciate them. I also like to get some PNs.

And at the end -thank you for your help!