Before launching Cubase, move the VST3 version of MOVEMENT to Program Files/Steinberg/Cubase/VST3
Launch Cubase. Navigate to the "Other" folder in your VST effects and load MOVEMENT.
Click on the sidechain icon to activate MOVEMENT's sidechain input. It should turn orange.
Finally, set up an aux send on the sidechain trigger track and make sure to send to MOVEMENT (circled in yellow). Adjust the send amount to taste, and MOVEMENT will now react to the sidechain signal.