As Dragon said, the BMS Installer requires that you have an original Falcon 4.0 Disc inserted into an optical drive at the time of installation. This is required as it has the Falcon4.exe file on it which the installer needs to commence the installation process. You DO NOT
have to install the original version .... just have the disc in the drive and if required point the BMS installer to it when asked (although I think from memory it looks for it automatically .... but I could be wrong and if so then my original statement applies
Alternatively if you do not have an original disc but have the Falcon4.exe file backed up somewhere else you just need to point the installer to that file.
If you are unable to do either of these options .... then the BMS installer will not run and you will get the error that you have gotten so far.
To put it simply .... the BMS installer needs the Falcon4.exe file to install.
Hope that helps ....
P.S. If you can't get your answers here regarding the install process, or any other questions you may have, here is the URL of the design group: http://www.benchmarksims.org/forum/
.... if they can't answer your questions then I'm betting no-one can