: Arc Hydro installers will not overwrite existing versions. Use Windows "Add or remove programs" to remove any older Arc Hydro installations before starting.
After installation, the tools will not appear automatically. To see them: Download and Install Arc Hydro tool in ArcGIS download arc hydro tools for arcgis 10.7
You must have administrator rights on your machine to complete the installation. : Arc Hydro installers will not overwrite existing versions