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After updating to 20.11 pdflatex, called from TexStudio, exits with error

! Extra \endgroup. ! LaTeX Error: Missing \begin{document}.

Version 20.6.29 works fine. Both version was tested on Win7 and Win10 x64. File prl.tex for test placed on https://cloud.mail.ru/public/7K2F/5CGYz1ahD

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  • @DavidCarlisle it works in texlive, but miktex seems to be missing an update. I will check.
    – Ulrike Fischer
    Commented Nov 15, 2020 at 23:07
  • @DavidCarlisle it has been updated but it is in the obsolete tree on ctan, so miktex probably ignored it.
    – Ulrike Fischer
    Commented Nov 15, 2020 at 23:11
  • @boristim Why don't you use a current revtex4-2 instead of the old revtex4?
    – Ulrike Fischer
    Commented Nov 15, 2020 at 23:12
  • Why did the program, installed on November 08, stop working on November 15 without announcing a reason? Did I spend a day realising it was because of ther upgrade?
    – boristim
    Commented Nov 15, 2020 at 23:18
  • I have no idea what you did on november 15 to trigger the error. miktex can neither know that you are using a obsolete class from 2001 nor warn you if it stops working. And you didn't need to spend a day on it: As you can see it tooks us only 10 minutes to tell you what is going on, so next time ask earlier.
    – Ulrike Fischer
    Commented Nov 15, 2020 at 23:26

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