If all boxes are checked, your is VERIFIED and production-ready.
To ensure the toolbar functions correctly in 10.8, you must meet these prerequisites: VERIFIED-- Download Hec Geohms For Arcgis 10.8
Users often report that "characteristic" tools (like river slope or basin slope) fail in the 10.8 environment. If all boxes are checked, your is VERIFIED
One of the main reasons installations fail is not the download itself, but the lack of prerequisites. Before you run the installer, ensure your system meets these strict criteria: If all boxes are checked