Hi orkneylad,
I assume that you downloaded the updates and New Horizons from Shipsim.
i got them of here, lol.
If you go over to Technical support then I may be able to help you out. There are quite a few threads there, (about 11), that you will find if you use the search function, (using 'incorrect engine'), at the head of Technical Support.
If you still don't get an answer then post in Technical Support and I will see if we can come up with a solution.
Regards, Dave