I have a problem with X-Plane 12. Before I added a lot of different liveries in X-Plane 11 and X-Plane 12. 

I downloaded it from X-Plane.org and X-Plane.to. Almost all of them worked with no problem. 

The liveries I downloaded lately (I tried a lot of them) are simply not working and I did exactly the same procedure like before.

I didnt change anything in the game. All the maps in the game are like before.

I have no idea why this is happening!?

Please if you have some advice for solving this problem I would be very very happy.

Thank you very much.

You did not state exactly what your procedure was, so nobody can tell you what you're doing wrong.

For what it's worth, use the simple "If thing A works, use it as a reference to check what thing B does wrong and fix thing B" approach, i.e. see what the working liveries do right and, with that information, fix the non-working liveries.

1. If its an old livery for older model, it may not work on the xp12 ver.

2. If your talking about not showing up in selection screen, simply means it has no preview. You can generate new ones in xplane.

Solved. The was some problem with folders.