How do i get DirectX 11 for my Mas OS

what windows version did you install in bootcamp to play your windows game ?

what error does it give in windows when you attempt to launch the game ?

if you need to get specific bootcamp related support then I would advice the forum for bootcamp

Boot Camp

if it's not general windows directX support

Directx 11 problems when trying to play some computer games - need to - Microsoft Community

Still need to know the operating system version that your iMac is running. As Rudegar has commented, there isn't a version of DirectX for the Mac operating system. It would have to be installed under Windows. For that, you basically have two choices:

1. Create a Boot Camp partition and install Windows there, or
2. Use a VM manager, like Parallels or VMware to host a Windows VM.

DirectX 11 is not available for macOX.

If you wish to run it, you will have to install Windows using Boot Camp.

Which version of OS X or macOS is your iMac running?

This issue has nothing to do with Apple networking. I will ask the forum moderator to relocate it to the iMac area of the ASC.