BASIC-PLUS 2 install on RSX-11M 4.6

Hey all, I'm trying to install BP2 on my SIMH system (need to fix my 9-track before it'll be worth trying on real iron). I'm having some trouble with the install, though. I'm using the 2.7 tape found on trailing-edge's rsxdists FTP area, and I can copy BP2RSX.CMD just fine. However, when I try to run it and install, one of two things happens, depending on my choices: - If I select the prebuilt distribution, there are a number of files missing, and it barfs after a number of errors. - If I select non-prebuilt, it crashes with a "Reserved inst execution" error; if I delete the .ENABLE QUIET at the start of the indirect file, I see that this happens when it tries to execute the DIALOG.TSK file it's just copied. I'm not in the mood to actually run this through a debugger, since I'm still somewhat unfamiliar with development on RSX. Does anyone know if this is maybe a known dodgy tape image? I can list the directories just fine with FLX, so I assume it's not totally boned, but this is puzzling me (partly because I'm a bit new to RSX and the like). - Dave