While HEC-GeoRAS for ArcGIS 10.8 remains available for legacy projects, it is no longer the primary development focus for HEC. Users seeking the latest features and long-term support are encouraged to migrate their workflows to the integrated RAS Mapper within HEC-RAS. For those who must remain within the ArcMap ecosystem until its retirement, following the strict installation order and using the 10.8-specific versions from the Esri FTP remains the most viable path. HEC-GeoRAS Downloads - Hydrologic Engineering Center
: Completely remove any older HEC-GeoRAS versions before installing the 10.8 update to avoid configuration errors. hec georas for arcgis 108 upd
: Download the compatible version (typically 10.8 or the latest version for ArcGIS 10) from the HEC-GeoRAS downloads archive . Data Preparation While HEC-GeoRAS for ArcGIS 10