That's weird and I agree, but it's not the first (nor the last) time something weird happens in RW3. This is why, after you posted about Pack01, I tested (BTW twice) separated in an old backup installation in wich I had bought (at the time) only Pack02-03, and then in a clean installation where I previously deleted all folders of Pack02-03, and be sure I couldn't load engines of those packs (Volume 2), remaining only Pack01 functional.
I also I took the care of doing tests with the file download from RWA Library, not with the one I sent to Krell and then he uploaded to Library. If still has something with missing Pack01 (it's possible, why not?!) I have no clue what could be, but I tried to replicate the problem and it didn't happen in my machine. It happens with such variety of rigs, Windows versions etc., sometimes the problem (I would say the diversity) is at user end side, but it doesn't mean that is a user's fault, is just something unknow, out of user control.
Dou you wanna a thing more weird then the Dash 9 update? working for some since first attempt and nothing for others so far (a fix is on the way I know). Of course is slightly different once it seems that Dash 9 update was not only about some few files adding lighting and rainny windows (could be) but a whole directory pack in which they changed everything unduely IMHO (maybe due to copyright features). Our pack is only a bunch of lighting and sounds files, in the same way was done several times before, using the reliable RW Tools installer. I also can't understand...
Cheers,
Doc.