First, this is an amazing patch. I remember back in the day, getting an extra copy of WM 2000 so I could use a game genie for the AI menu and port some VPW2 wrestlers to that game for Stone Cold vs Misawa. This is pretty much my dream game on steroids.
Second, some help for some who are having trouble with the patching since it took a bit for me to figure it out. The main problem is that the file needs to be in the .Z64 format. All of the VPW2 roms available seem to be in the .N64 format. All you need to do is use "tool64" found at
http://www.zophar.net/utilities/n64aud/tool-n64.html . Open it up and go to the directory the rom is in. Choose it and press the left arrow icon and that's all. After that, just use delta patcher and it should work.
