Using HEC-GeoRAS for ArcGIS 10.8: Compatibility and Best Practices
While remains a trusted solution, the USACE has released HEC-GeoRAS for ArcGIS Pro (version 10.9+). Consider migrating if: hec georas for arcgis 10.8
: If you encounter errors after upgrading ArcGIS, perform a clean install in this specific order: uninstall HEC-GeoRAS, then Arc Hydro, and then reinstall the latest 10.8-compatible versions of both. The Future: Moving Toward RAS Mapper Using HEC-GeoRAS for ArcGIS 10