Therefore, when searching for a , you must ensure you are not downloading the "ArcGIS Pro" version. You specifically need the ArcMap version compatible with the 10.6–10.8 range.
Remember: Arc Hydro transforms raw DEM data into actionable watershed models. Whether you are delineating catchments for a stormwater project or building a national river network, the tools you just installed are the gold standard. download arc hydro tools for arcgis 10.7