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This question already has an answer here:

I am using MiKTeX 2.9 and TeXnicCenter to compose and execute my LaTeX file(s) on Windows 8. When compiling, my code has this error:

Mathtools.sty not found

What should I do? How can I add this package?

marked as duplicate by Svend Tveskæg, Werner, Masroor, barbara beeton, Jesse Oct 14 '14 at 15:34

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Go to Miktex 2.9 settings and check if you allow "install package on the fly". If not, allow it.

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