Hello!
I’m probably not the only one who had to do some digging to find a copy of the original Falcon 4.0 so I could get BMS installed. I ultimately had to go through eBay (and got the full set of manuals).
I just discovered, however, that GOG.com (the outfit formerly known as Good Old Games) has recently released The Falcon Collection, including the original Falcon, Falcon AT, Falcon Gold (Falcon 3.0 plus expansions), and - most relevant to this forum - Falcon 4.0 v1.08.
I suspect that this should be enough to get a BMS installation rolling.
Hope this is useful!