Windows 10 and Windows 11 are supported for ArcGIS 10.8.
This is a 64-bit vs 32-bit registry issue. The HEC-GeoRAS installer is 32-bit. Manually copy the extracted files from C:\Temp\HEC-GeoRAS_Installer to C:\Program Files (x86)\ArcGIS\Desktop10.8\bin\ . hec georas for arcgis 108 upd
The output path or file name violates old Esri formatting limits. Windows 10 and Windows 11 are supported for ArcGIS 10
The version tied to is the last stable build for the ArcMap environment. The "upd" (update) typically refers to the final patch that resolves compatibility issues with Windows 10/11 and the specific .NET framework requirements of ArcGIS 10.8. the left overbank
Three separate lines tracking the center of the main channel, the left overbank, and the right overbank.
Broken .NET framework linkages or missing administrator permissions.