# Missing mathtools package [duplicate]

I am using Windows 8. I have installed MiKTex 2.9 and TeXstudio. However, when I compile the document, the process exits with the following error:

``````File `mathtools.sty' not found. \usepackage
``````

When I searched for the solution, it suggested to open the package manager folder in MiKTeX. However, I could not find any folder in the main MiKTeX folder.

I have tried re-installing MiKTex and TeXstudio, but the problem still persists.

I really hope that you can help me and explain in a simple way the mistakes I am doing.

Thank you!

## marked as duplicate by percusse, Mico, barbara beeton, user31729, user13907 May 28 '15 at 18:59

• (1) Welcome, (2) Please open the miktex package manager. In one of the menus there is an item called 'synconize', use it, Then find and install the `mathtools` package. Note that `TeXstudio` is not related to this. – daleif May 28 '15 at 12:39