Nevermind, I found out what I did wrong. I tried to copy all of the new models into the pbo at the same time. I tried copying the files one at a time and now everything works.
The sky looks better than the default OFP sky. One thing I noticed, though. The textures near the top of the sky dome are stretched. Is there any way to fix that?
Also, when I start up OFP without HW&TL with this sky pack, I recieve missing .p3d errors. Is there any way to get the addon working without HW&TL?
-Pilot