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While installing the newest game of the Medal of Honor series, I got a strange DLL error saying that the game couldn't be launched.

When I installed DirectX 11, available as an installer, it worked.

Is it mandatory to install all the DirectX installers for subsequent different games?

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You must install all the DirectX interfaces so that earlier games can use them, but not all the versions of the DirectX runtime itself -- just the latest. –  David Schwartz Oct 29 '12 at 20:35
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Is it mandatory to install all the installer for DirectX for subsequent different games?

Considering a game can use a specific date release of Direct X its always good to install the EXACT version the game expects. There can be differences in the actual output of a method, if say there is a bug, and the developer adjusted their code to compensate for known behavior.

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relevant forums.steampowered.com/forums/… –  Chris Nava Oct 29 '12 at 21:33
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Depending on the Game you are installing you have to at times install Direct X updates that has been happening for a long time and in every version of Windows.The only difference is the Direct x version its updated right now...

Hope this Helps...

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