David Carlisle d.p.carlisle at gmail.com
Tue Jun 9 21:48:17 CEST 2020

You do not give any clues about what your input looks like.

You say "Article.cls not found"  the class is article.cls with a lower case
a so (on a case sensitive file system)
\documentclass{Article}
probably won't work. (it may work in some case insensitive settings but it
shouldn't be used)

If you have
\documentclass{article}
and it isn't working, show the log you get from a file with

\documentclass{article}
\begin{document}
\end{document}

On Tue, 9 Jun 2020 at 20:39, mcai5 <pof at cybermesa.com> wrote:

> Sirs:
>
> I recently joined TUG in order to find a solution to the  ‘article.cls not
> found'  problem.
>
> Today I downloaded and installed a new copy of the complete TeX system,
> after deleting all traces of it yesterday.
>
> The problem still remains, as I observed when I attempted to compile a
> paper I am writing.
>
> Where can I get a copy of ‘article.cls’, and how should I install it so
> that TeXShop can find it?
>
> Respectfully submitted,
>
> Paul O. Frederickson
> 1372 47th Street
> Los Alamos, NM 87544
>
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