I am trying to solve a variety of problems in ArcHydro and it looks like I need to install a patch. I am using ArcMap 10.6. However, when I download the patch here: ArcGIS (Desktop, Engine, Server) 10.6.1 Spatial Analyst Patch,
I receive an error that it cannot be installed because the program may be missing or the patch may update a different version of the program? But I am running 10.6? Where can I find a link to the correct patch???