How do i get DirectX 11 for my Mas OS

DirectX 11 is not available for macOX.

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

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.

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.