I downloaded your pack from the german site. In the extracted files:
Buidlings-Old BLPS there is nothing. I looked. Nothing. Made me very sad.
I imported ALL the new blps, along with House1_var1. I changed paths to Textures\RTES\"NAME".blp as directed. House1 along with all of the other buildings didn't load. So I'm thinking the problem im having is that the old blps and the path I used are for the buildings. Which the old blps are not there.
But the trees did fine. And your tiles are great. I don't like the dirt one, with the double jointed rocks. It looks very bad, and if you cover a map in it, you'll see why. The stone path is great. Your trees are incredible. Leaves are perfect.
I would be pleased if you looked into the old blps folder. May be a problem. I downloaded it again, still has nothing in it. Is it supposed to? Well, try to figure it out. The models would help alot of terrainers out. thanks!