I've tried to install jcallses like jsarticle according the answer on question How can I manually install a package on MiKTeX (Windows). The results are...
- If to execute latex.exe on jsclasses.ins in temporary directory, not ...\MiKTeX2.9\tex\latex\base, it will install on this directory. Of course, this class files will not be founded. (! LaTeX Error: File `jsarticle.cls' not found.)
- It's not recommend, but if to copy jsclasses.ins in ...\MiKTeX2.9\tex\latex\base (I've explored that simple article.cls loading from there) and execute latex.exe from there, it reads '! I can't find file `jsclasses.ins' (it's not my mistake).
- If to copy jarticle.exe from temporrary folder to ...\MiKTeX2.9\tex\latex\base, the result be (! LaTeX Error: File `jsarticle.cls' not found), too.
Please, tell me where is the mistake.