Executable for Windows is here : https://blenderartists.org/t/bakemyscan-open-source-toolbox-for-asset-optimization/1133347/47?u=jr_l
and it works with the new blender addon BakeMyScan.
What could be the text in params.txt ? I tried: "[in]" --faces [Output_polycount] --output "[out]", with no succes.