OK, this should do the job happily.

Outside any function, up the top somewhere add in
then anytime you come across a line using pure 'temp' (just 'temp' by itself - leave temp.x or temp.y or temp.z alone)
that wont compile (that is "cannot convert struct vector to fixed" or "cannot convert fixed to struct vector")
use 'temp.x' instead.

Thats how I had to do it to get C-script to convert.

*** CORRECTION ***
I have corrected the above snippet from VECTOR ... to VECTOR * ...
Leaving this * out could have caused many strange and seemingly unrelated faults.. Sorry.