Volvo V70/Bosch Motronic 4.4 Reflashing

So I've been looking into reflashing a buddy of mine's Volvo V70R, because it's pretty much the perfect way for me to familiarize myself with reflashing. Lots of guys in the Volvo community have done a bunch of research on the Motronic 4.4 platform, and you can do a bunch of cool things with it. They've even gone so far as to write a Wiki on it. They use an open source tuning program called TunerPro, and they have this whole article about how to set it up. I have downloaded everything that is recommended, and I went and got myself and OBD II cable with the recommended FT232RL chip.

Now the thing about me is that I am not exactly an IT wizard. I can figure out the basics pretty quickly, especially with a decent source of information, but it can occur that I lose the plot pretty quickly once stuff gets a little in-depth. Now you might be tempted to say ''then reflashing is absolutely not for you'', and you might very well be right, but that's not going to stop me from trying first.

The part where I kind of lose the plot is the 6th tab of the ''Setting up TunerPro'' part, which states the following;

''Step 6: Install the Flasher Plugin. Extract the Flashing Plugin .zip (or .rar) and place the 2 files in the TunerPro root folder. In TunerPro, go to Tools -> custom Tools -> Edit Custom Tools. Click New Tool. Give it a name like "Motronic4.4Flasher", then select Tool Path, and select the .exe file you downloaded.

Then under Cmd LIne Params add "$(CurBinPath)" COM1