I'm also coming back into BWP after a hiatus and I ran into the same problem. When using Windows 7 (in a Parallels VM), patch.exe has permissions problems, even when using a generic folder, shutting of UAC, and all the other things mentioned in the MegaMod Help forum when dealing with Windows 7 and weidu et al. When I fired up a XP SP3 virtual machine, all patches worked normally. My focus right now is getting a version of BWP 11.1 that I like working, so I'm staying with the XP VM, but I'll eventually tackle a way to cleanly "BWP" in Windows 7.
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