NewWolf port has a built-in support for High-Resolution textures, which you can take from the project's page on SourceForge.net. This is a link to download page for textures.
Installation instructions:
Download and unpack textures' archive to the project's folder (in my case this was 'e:\games\wolf3d\'). Check that the contents of 'Basewgl\' folder merged correctly, so the list of files inside is as following:
If everything was unpacked correctly, the only file added should be 'pak1.pak' file.
Start the game using 'NewWolf.exe'. No further configuration is needed, as the game will find and use texture resource files automatically.
Overall, this is a nice texture pack, but some of the required textures are still missing, as you can see on screenshots.