To deploy HEC-GeoRAS successfully on ArcGIS 10.8, specific license configurations and secondary toolsets must be met to avoid script compilation errors. Software Prerequisites
The "108 upd" in your query refers to version 10.8 of the Esri ArcGIS Desktop suite (often called ArcMap). HEC-GeoRAS is a legacy extension that is compatible with ArcGIS versions 10.2 through 10.8. It is critical to ensure that the version of HEC-GeoRAS you download precisely matches the version of ArcGIS installed on your computer. As later updates of version 10.8 are specific, you should check the official USACE website for the latest compatible build. hec georas for arcgis 108 upd
Intersects the terrain to extract elevation profiles. Digitize the Features To deploy HEC-GeoRAS successfully on ArcGIS 10