Maaaybe just write what problems you have, so anyone knowing a solution can help you instead of first writing to you with that question (and hoping that it’s a problem they know a solution to?)?
It is that they are enough problems.
Still, it’s true. I better explain it.
I follow the steps of the wiki, and I fail to check the maps (they give me dead vertices), and then, when importing into the unreal, the car comes out without the colors of the tutorial (and I loaded correctly the maps, as well as apply them), and also the car, turned down. And I checked the orientation, and it’s the same as that of the example car
If it looks just plain grey in unreal, you have to assign the materials on the left side of the window. Usually you only have to do that once and it will stay when you re-import different versions of the same model. If you have colors but not the checker-like pattern on the main body panels, then your UV map broke before it exported. As far as the car turned down (upside-down?), you checked to see if it is on the positive side of the Z-axis right?