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Hi,
Sorry not to have answered to the comments done by localghost and cgnieder because I was busy (teaching).
Following what you notice concerning Miktex, I have read the MikTex Manual then I have uninstalled Miktex and re-installed it in order to get a "clean" packages installation.
Result : it ...

Hi,
I succed in generating the xfrac.sty (and the other file.sty) by using the cmd console of windows. I have run twice "latex l3.ins" which is located in the l3kernel, then I have run xfrac.ins twice ...then I copied it in the folder l3packages...
but I still get error message (LOG FIL1.pdf)
I don ...

Hi,
I have found xfrac.dtx and xfrac.ins in the l3packages...where can I found xfrac.sty ?
Here is the limit of my knowledge...
thank you
Jobic

Thank you for your answer.
You are right, my packages were outdated (I can't understand with the Miktex Update Manager didn't detect it.
I have updated the three files l3kernel, l3experimental and l3packages : downloaded and extracted in the Miktex folder.

I have run refresh FNDB in Miktex Setting ...

Hi,
I use TexMaker Editor with the MikTex distribution (OS Windows XP)
I want to write document dealing with chemistry for my course (Newman Molecular Representation).
In that way, I want to use Mychemistry and chemmacros packages.
To practise these packages, I have copied the following code in ...