Hello all,
After a few days of working on things, I have written a guide for getting you started with the KWP2000+ and the Smart 450 CDI. This guide includes the (often hard to find) software thats needed, setup of the software and hardware, and instructions on how to read your stock tune file and write a new tune file to it.
The attachment includes the guide and software.
Please let me know if you have anything to add or any questions.
Big thanks to @stickman007 for his assistance with the software and troubleshooting!
KWP2000 Smart CDI Edition.zip