Both 3D Analyst and Spatial Analyst extensions must be installed and active. Operating System: It is strictly compatible with Windows .
Install Arc Hydro first, followed by HEC-GeoRAS. hec georas for arcgis 108 upd
To run HEC-GeoRAS 10.8 successfully on ArcGIS 10.8, you must meet the following system and software criteria: Both 3D Analyst and Spatial Analyst extensions must
You should use the specific setup package for your version, such as HEC-GeoRAS 10.8.0.3 for ArcGIS 10.8.0/1. hec georas for arcgis 108 upd
HEC has largely transitioned away from GeoRAS because (including 6.0+) now includes RAS Mapper .
Access the Esri Public FTP to find the matching version for 10.8. Community-verified versions like 10.8.0.3 are the most stable for the final ArcMap releases.