Hi. I want to do flood zone modelling and am using Arc GIS 10.4. The HEC-GEORASS in the MFT site is only for 10.3. Where can I get ArcGIS 10.3? Can I use my lisence for 10.4 in 10.3? Alternately, Where can I get HEC-GEORAS for ARC GIS 10.4?
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