The v1.3 version should work with non-SNAP drivers, too, it's just that the DPMS settings will be disabled, because they are available through some special SNAP GA functions only.About the empty folder:
First I've thought that it's a bug of an older WarpIn version, because installing WarpIn v1.0.4 solved it. However, it seems that it hasn't solved it for everybody. 
I'll look into this problem. Meanwhile, you can find and read the readme.txt, license.txt and changelog.txt files in the destination folder, if you're interested. It seems that WarpIn extracts them, just cannot create the objects for some reason.
Doodle