HEC‑GeoHMS releases are tied to ArcGIS/ArcMap versions. For ArcGIS 10.8 you should use the HEC‑GeoHMS version built for ArcGIS 10.x (10.0–10.8). Check HEC’s documented compatibility if available.
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Are you still working within the ArcGIS 10.x environment and struggling to find a compatible version of HEC-GeoHMS? You aren't alone. With the shift toward ArcGIS Pro, finding stable installations for ArcGIS 10.8 has become a challenge. HEC‑GeoHMS releases are tied to ArcGIS/ArcMap versions
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The information provided in this blog post is for educational purposes only. The author and the blog owner are not responsible for any damage or loss caused by the use of HEC-GeoHMS or ArcGIS. Always follow the terms and conditions of the software license agreement.