MikTeX can’t find xstring [closed]

I’m not using MikTeX myself but someone I developed a class for. And it seems like there’s a problem with xstring. The following MWE compiles fine with my TeX Live 2012 but MikTeX (on Win 7) can’t find the package, although it seem to be installed correctly installed. Furthermore MikTeX should install missing packages on the fly, shouldn’t it (the feature is activated)?

\documentclass{article}

\usepackage{xstring}

\begin{document}
Test
\end{document}


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closed as too localized by Tobi, lockstep, Stefan Kottwitz♦Nov 6 '12 at 19:56

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That's an error in the miktex package. xstring.tex is missing. The bug has already been reported. Until the package is updated: Get xstring.tex from CTAN manually and put it somewhere where it can be found (e.g. in your current folder, or in a local texmf). –  Ulrike Fischer Nov 5 '12 at 9:12
Bug tracker is (not clear from the miktex home page) at sourceforge.net/p/miktex/bugs/2185 –  cyberSingularity Nov 5 '12 at 9:14
@UlrikeFischer: Thank you, if you post an answer I’ll accept it, or should this question be closed? –  Tobi Nov 5 '12 at 10:51
@cyberSingularity: Thanks but I wasn’t sure if this is a bug since I’m not familiar with MikTeX … –  Tobi Nov 5 '12 at 10:52
I got the file from CTAN and placed it in Miktex 2.9\tex\latex\xstring under win 7 and unfortunately this is not working out for me... any sugeestions? –  user21774 Nov 5 '12 at 12:24