Sounds like you may have pulled the HydroSim.exe out of the folder group for an easy access shortcut, not sure, but it's been done by a few. That error message will show up if you do that, the HydroSim.exe must be opened in the folder group. Re-download and overwrite it again and try opening the HydroSim.exe where you find it, don't move it. you can always pull the whole group to the desktop if needed.
Posts made by Czerwinsalot
RE: game won't start