TL2021: the seminar class and hence the prosper class broken

[Herbert Voss]

Am 30.06.21 um 15:40 schrieb Dr. Werner Fink:
> On 2021/06/30 14:43:52 +0200, Herbert Voss wrote:
>> Am 30.06.21 um 14:29 schrieb Dr. Werner Fink:
>>>    ! Extra \endgroup.
>>>    \document ->\endgroup
>>>                          \the \before at document \begingroup \UseOneTimeHook {beg...
>>>    l.12 \begin{document}
>>>
>>> As it looks like seminar class isn't developed anymore
>> that's true ... However, try it with the version from today:
>> https://ctan.org/tex-archive/macros/latex/contrib/seminar/latex
> many thanks for this pointer.  I'd like to ask what about this
> differences between seminar.bg2 used with TeXLive 2021 and the
> version on CTAN ... also the new seminar.bg3 and the missed
> tvz files on CTAN. What is the ratianl bebind these changes?

I have no idea here. I used only the files which are for ages in my
seminar directory which I inherited from Timothy Van Zandt.

The tvz-*.sty files are part of the doc directory.

Herbert