Could you please try the attached file, to be placed into the fsdreamteam\Couatl\common folder ?
Tried that -- no difference, same crash, same place.
As an experiment I also tried loading the COUATL.EXE from the FSX folder instead of the FSX-SE folder. No difference.
The only solution is to have the GroundVehicles SimObjects path in the FSX-SE folder. This isn't a real problem, it's just another folder I have to make sure is correct, alongside Gauges and Effects, whenever I update anything installed into FSX-MS. One day, when I've moved over to FSX-SE completely (as looks likely at present given the much better performance I get with it), it will be an old forgotten problem in any case, even without any fix on your part. ;-)
Regards
Pete