Download UNIGINE 2 SDK: https://l.unigine.com/PJTdh3_Yg
Key changes in 2.12 release:
- Improved particles simulation with advanced control
- 2x physics performance optimization
- Better clouds and atmosphere improvements
- .NET Core 3.1 integration and C# API improvements
- Advanced control over Landscape Terrain details
- New Earthworks demo
- Multiple IG and Syncker improvements, dead reckoning for DIS protocol
- New content add-ons: Airport and Industrial assets
- UnigineEditor product in the Sim edition  

Full release notes: https://l.unigine.com/Mvaov_Agt