HTC has a program to convert the old skins to the new format. New skins must be made to AH3 standards. The only way to get skins fir the Pre-release is to auto download them (this takes a very long time)
Mols, if the skin name on the roster is black then you should be able to use it, if it is red then it has not been downloaded yet. Also, if you have the plane selected for the skin you are waiting for before it downloads, then you need to select a different plane then go back to the original to reset the roster and display the new skins.