Simplygon 9 is currently available only for Simplygon Title licensing customers.
It will be available for Simplygon Free users soon.
Preview releases of Simplygon 9 SDK and source code for standalone Simplygon UE4 Plugin are available for members of Simplygon Insider Program.
All stable releases of Simplygon 9 SDK are available only for Simplygon Title licensing customers.
Older Simplygon SDK & API releases are available only for Simplygon Title licensing customers.
Advanced source code UE4 integration releases are entitled to Simplygon Title licensing offering.
Simplygon UE4 Plugin is new standalone UE4 plugin that will gradually replace current advanced UE4 source code integration.
As a standalone UE4 plugin, it reduces tedious source code merging in the engine while it also offers ability to distribute LOD generation on arbitrary build system.
The plugin is currently in preview in Simplygon 9 and only available as source code package, but will in future be released as precompiled part of Simplygon SDK as well.
The preview version of the plugin can be found at Simplygon 9 Preview Releases.