Barron, you're thinking of the "Direct Fire Artillery Script" or sometihng. It never worked on my copy.
it's not "Just like UA" for a number of reasons (limited to 3200m, low-angle only, all script based, firing tables instead of neural nets, limited control system, not-MP compatible), but it is about as good as you're going to get for 1.46.
And if you really want something for Single Player that seems realistic, you can always get my artillery suite from last year, which uses camcreated shells.
Sorry guys, we're not going to develop for 1.46. Only about half the hacks we used in UA would work, so we'd have to develop an entirely different product, and it wouldn't be as good. That's just a waste of time.
Now, if you were to pay me $10,000, I'd have the time and money to do the port, and it would work reasonably well.