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Well, I downloaded both of them today (Doomsday 1.15.8, jDoom Resource Pack 1.01) from this site, but I did manage to get the 3D models running. Although now I can't see the weapon I'm holding.
I was looking information about how specifically load 3d models for Doom using the DE2 (I'm using #2047). I was able to run all the .pk3 addons posted in the download section, except the DOOM Resource Pack (jDRP) 1.01, which is in .box version. If I unzip the file, and I try to load individually, DE2 crashes and the frontend is unable to pick the box folder as a whole, as different to the behave in version 1.15.
The correct way to load jdrp-packaged-20070404.zip is to first unzip the contained jdrp.box folder in a place where Doomsday looks for add-ons. It should then be detected as "jDoom Resource Pack (jDRP)" with ID "file.box.jdrp", and that can be selected in games as a package to load.