For any Direct X neophyte's (like me) I have a new machine with DX 11 and was concerned about installing DX 9 for fear it would overwrite something and cause problems. With strictly DX 11 I could not use the Ankor's shadow mod.

I installed DX 9 with the above link and it apparently overwrites nothing, everything is working fine, and my system still lists itself as DX 11.

I have to say the shadow mod is one impressive piece of work and really works well, looks incredibly great, and causes no FR loss.
Run, don't walk, to get it and you will be amazed.
I was.