just email a known software vendor. Eurodyne.ca, APR, GIAC. they will all get you in the same place.
problem with the 1.8T is due to its age is has lost alot of support. i know APR doesnt do much with them these days. but companies like Eurodyne, and Unitronic chipped are still big players, probably the biggest in the 1.8t world.
i have used APR, Revo and Eurodyne on my 1.8t vehicles. all did their respective jobs very well.