It is very easy to install. After you install this software, virtual MIDI device will be created in your system - it is called "Loop BE Internal MIDI [Emulated]".
Now you just have to use output synchronizer from one Fiesta and set it to MIDI-MTC and select its output device as this LoopBE. In the second Fiesta you select input MIDI synchronizer to MIDI-MTC and also select to Loop BE. Don't forget to start play show in the Fiesta with MIDI-MTC input synchronizer before playing the show in Fiesta with MIDI-MTC output synchronizer!