DirectX 9 on DirectX 11?

What will happen if i run the setup of directx 9 on my pc??....i already have directx 11 on my pc...but when i installed some of my old games again it suggest me to run dirctx 9 what will happen if i run directx 9 setup? it replace my directx 11 to directx 9????
Update: @goku...thx ....i checked it but shows dx11 it means directx 9 is not installed ???
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