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After installing the latest miktex (20.11) on my new laptop, I tried to compile the following simple presentation in seminar style:

\documentclass[portrait]{seminar}
\begin{document}
\begin{slide*}
aaa
\end{slide*}
\end{document}

But I get the following error:

\document ->\endgroup \the \before@document \begingroup \UseOneTimeHook

On another machine where I use Miktex 2.9.6670 it works just fine.

Writing simple articles and Beamer presentations works fine.

Can anybody please help me. Thanks in advance

I also tried to find old miktex version 2.9.6670, but I could not find it anywhere. Andrej

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    Seminar is a very old class and not compatible with a new latex. Why are you using it instead of e.g. beamer? – Ulrike Fischer Nov 15 '20 at 8:18
  • Thanks for your reply. I know, it is a very old class, but I have several presentations prepared in this way. For newer presentations I use beamer, but it would be a lot of work to update all this old presentations in seminar style to beamer. So I will be very thankful if there is a way to compile seminars presentations. Andrej – Andrej Mrvar Nov 15 '20 at 8:20
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    Contact the maintainer and ask if he is willing to update the class to make it compatible again ctan.org/pkg/seminar (he should already know about the incompatibility) – Ulrike Fischer Nov 15 '20 at 8:26
  • Thanks. I did. I will see if he (Herbert Voß) will answer. BTW is it possible to get Miktex 2.9.6670 complete installation anywhere? – Andrej Mrvar Nov 15 '20 at 8:36
  • You can also try to roll back to an older latex with latexrelease tex.stackexchange.com/a/565938/2388 – Ulrike Fischer Nov 15 '20 at 8:37
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seminar patches \document in a way that is not compatible with a LaTeX 2020-10-01 and the new hooks the format implemented (the maintainer has been notified some months ago about the upcomming problem).

As a work-around you can rollback to an older latex with latexrelease:

\RequirePackage[2020-02-02]{latexrelease}
\documentclass[portrait]{seminar}
\begin{document}
\begin{slide*}
aaa
\end{slide*}
\end{document}

Be aware that this doesn't work with every package: if a new version of a package requires a feature of the new format it can fail or error if you rollback.

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  • After restarting the computer and refreshing the file name database the example tex file with addition "\RequirePackage[2020-02-02]{latexrelease}" at the top compiles without any problem, Even more: now, with this addition, I can compile all my old presentations. Dear Ulrike: THANKS A LOT. You saved a lot of work and time to me. I really appreciate your help. The problem solved. – Andrej Mrvar Nov 15 '20 at 17:02

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