No, as far as I know the DX9 rollups update separate files that DX10 has nothing to do with. You don't need to download DX9c, all you need to do is get the latest DirectX rollup (December I think was the last one). The web installer might work for you too, to be honest I'm not sure.
Edit:
Ironicly, the the February Roll up came out today.
http://www.microsoft.com/downloads/...38-db71-4c1b-bc6a-9b6652cd92a3&DisplayLang=en
Edit:
Ironicly, the the February Roll up came out today.
http://www.microsoft.com/downloads/...38-db71-4c1b-bc6a-9b6652cd92a3&DisplayLang=en
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