I think you would have to go back to 5.5 or before. 5.6 may have come out before the DX9 patch, I'm not too sure. But theres tons of versions that are between November of last year and 5.5 in February. I'm not sure if anyone can tell you exactly what version you would want. Last one I know for sure is that 5.3 is compatible with a patch that came out in January.
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