Solved! Go to Solution.
I am also in need of an update for ArcHydro that can be used in ArcGIS 10.1. I just tried to install using the latest, that I could find, ArcHydro installer and got an error saying that ArcGIS 10 wasn't installed on my system. I tried downloading from the FTP site and the website (http://resources.arcgis.com/content/hydro/surface-water/about) with no success.
TIA,
Paul
Current password is ADSRiver.2014b
Christine