It is probably a good idea to set your $PATH to include the bin directory. As you've had to do something similar in the last several projects, you probably know how to do this already.
Finally, in case you feel like installing Prolog on your personal machine and working offline, the /projects/proglang03/bin/swi_prolog directory itself contains a source tarball of SWI Prolog and an .exe from the SWI Prolog site, which claims to be the Windows distribution.