It has most but not all of the files for the long code helper, so you're moving bytes and bits blindly there, which is no
problem if you have a
guide to follow.
FWIW, I have been using 12.12 with my 2015
Cupra with no issues other than some blind coding, and a friend's 16.8 from time to time, but even that one doesn't have all the files for long coding.