(first exuse me for bare English - its not my native language, and i not using a machine translation).
To install nude mod on your PWI (or on russian mailru version as well) follow these steps:
1. Download nude pack with installer and tools:
MOD.
http://www.ulozto.net/xLbUc4u/pwi-all-races-nude-modified-7z
or these
PWI all races nude.rar
Tool.
https://www.4shared.com/postDownload/a7SvUQ_Zba/64bitUnpacker.html
Huge thanx for authors :)
Or mod+tool in one file
pw.7z
2. Copy models.pck and models.pkx in separate (from client) folder
3. Run (double click) merge.bat, delete models.pck and models.pkx, rename models_new.pck to models.pck.
4. Goto nude mod folder and run autopatcher as usual :) He will undestand the file structure without external unpackers because file just splitted on two parts and not coded.
Be patient, installation takes time (about 5 minutes on my i5-2500 cpu) and finishes with "Patch installation complete" message box.
Remove models.original file.
5. Split models.pck to models.pck and models.pkx. Just run (double click) pkx.bat.
Remove models.pck, ren models.pck.1 to models.pck.
6. Move files to your client folder.
ren models.pck --> models.pck.bak
models.pkx ------> models.pkx.bak
copy new files models.pck, models.pkx.
Done! You may run client and enjoy the game!
Comment about client updating.
You may update patched files as usual with client autoupdating system, but it will be impossible to re-patch it (install another mod pack for example). So i will recommend you to keep original files (*.bak).