Cool!
The whole dx9c thing is a bit of a bone of contention, not just for installing DBPro but also running/sharing games.
dx10 and dx11 are missing things from dx9c that DBPro and games made using it require. The quote below is taken from the readme from Random Realms, created by IBOL:
Quote: "some computers may not have the .DLLs required to run the game.
included is the DirectX web installer, that will fix those issues on your computer.
even if you have DirectX 10 or higher,
that does not necessarily mean you have the files needed from 9.0c
the installer will NOT take away your dx10+, it will simply add what it needs."
I pretty much stole this when I created the readme for my game Purple Complex.
Anyway, I hope you can now get started and have fun creating some games.