directx 9 over directx 12?

[danlightbulb]

I bought an old game (settlers 2 10th anniversary edition) and on install i needed to install directx 9. Now I already have DX12 as part of windows 10. So I declined the dx9 install and the game wouldn't run. Did the process again and installed dx9 and it worked.

Why?

Will this have screwed up my DX12 components in favour of older dx9 components?

 

[danlightbulb]

Ok thanks. I expected these to be backwards compatible so if I have DX12 I shouldn't need any previous versions.