Question: what is the latest version of directx for windows 8.1?
Answer: DirectX 11.1 is included in Windows 8. ... 
DirectX 11.2 is included in Windows 8.1 (including the RT version) and Windows Server 2012 R2. ... 
DirectX 11. ... 
DirectX 11.3 was announced along with DirectX 12 at GDC and released in 2015.