On the HEC-GeoHMS page:
Since is currently the latest version of the 10.x series (before ArcGIS Pro), emphasizing "exclusive" or "hard to find" is a great angle, as many users are still on this version. download hec geohms for arcgis 108 exclusive
It is important to note that HEC-GeoHMS is entering its "sunset" phase. As of 2021, the HEC team announced they are no longer investing in HEC-GeoHMS development. Instead, they are integrating these GIS capabilities . HEC-GeoHMS Downloads - Hydrologic Engineering Center On the HEC-GeoHMS page: Since is currently the
While the Official HEC Download Page primarily lists versions up to 10.2, the 10.8 setup file is available via ESRI's Arc Hydro storage: HEC-GeoHMS Setup 10.8 Third-Party Alternative: SoftDeluxe HEC-GeoHMS 10.8.0.10 Informer Tech Portal: HEC-GeoHMS 10.8 Free Download System Requirements & Prerequisites Instead, they are integrating these GIS capabilities
If you encounter persistent errors with ArcGIS 10.8, consider upgrading to ArcGIS Pro + HEC-GeoHMS Pro, or revert to ArcGIS 10.6, where 10.3.3 was heavily tested. For further help, consult the official HEC-GeoHMS User’s Manual available on the same download page.