Several people have asked me why this is, so I'm just going to go over it really quick.
Using VX Ace materials in VX or XP requires you to own a copy of VX Ace (this is under the assumption that will use the same style of EULA as VX). The VX Ace trial user agreement ONLY allows you to use the resources contained in it in the trial itself.
Legally, allowing the Trial materials on the site to be freely used puts us in a crap position.
Once Ace releases, if you want to use the materials, buy a copy of it.
Now you know, and knowing is half the battle.
G I JOOOOOOOOOOOOOOOOOOOOOOOOOOOOE!!!!!