is directX11 is not supported on 32 bit windows? Because the button to enable directX11 in my game launcher is disabled, and when I login I forced to play on directX 9 mode. This happen too with my windows 8.1 PC before I upgrade it to windows 10.
when I run dxdiag, my directX version is directX 11 on windows 8.1 and directX 12 on windows 10.

My spec :
Intel Pentium G3240
4 GB RAM
Zotac Nvidia GTX 750 1 GB

thanks