You were meant to get the CD, then go through the sewers where you insert it into that console which then slides down and unlocks the doors. At least that's what I think it was meant to be. Even in A4 I had those elevator problems though and thus probably that door thingy too. That might have been a problem of the version on my Sybex CD though as I once had it running just fine (at least the elevators). I'm not sure though if I fixed a simple bug in the script or redownloaded a fixed version...

The Mission 2 seems to work just fine so far and is the superior game anyway...