If you are a part of community now, you gotta write down how did you resolve this, so in the future other people who would seach same question, could get an answer.
The games are very old, you need to pick the files paths by hand.
Maybe, if you mess up the game files yourself, you can get some vehicle moddels in. Othervise you can only mod Em4,Em3,Em5. Other versions - not.
So answers you your questions 1 Not possible. 2 There is none.
I am 100% shure, that some of the site members or discord are supporting that guy with donations input. SO the best thing you can do to support itchboy - cancell your money support on the thieft. (also would be nice if you spread the word between your friends and tell them to do the same)
Well what do you expect, 3ds got a lot more information in the moddel file, so when u use this dinosaur 2 it can't handle it all.
My gues, try to use online moddel convertors and find some extension that can be imported, might help?
You can try to pull out something like on personnel
No idea if it work, and not going to check either. And you can't make it work with more than 2 prototapes, so no multiple alternative="" - only one.