: Microsoft .NET Framework 4.5 or later is required.
: At least 4 GB is recommended, though 16 GB is better for moderate GIS tasks. : Microsoft
The official download for is available through the My Esri portal. Please note that the "Build 163864" referenced in your query is not a standard official build number; the final build for version 10.6.1 is 9270 . Key Details for Download & Installation: : Microsoft