The old Mephisto's Rebel 5.0, MM4 and MM5 are now available as UCI engines.
You can install them in the normal way as you are used to under Arena, Chessbase, Chesspartner or any other UCI compatible chess interface.
You now even can play engine-engine matches.
In the download package you will also find the Richard Lang programs: the Mephisto Amsterdam, Dallas and Roma. It's nice to see the 2 old rivals playing hundreds of games against each other now in a graphical interface.