Extra endgroup when using the Biometrika template

Question

I recently downloaded the Biometrika 2020 template to use to typeset a paper (please see: Stylistic Requirement here: https://academic.oup.com/biomet/pages/General_Instructions ).
When typesetting, I get the following error:
! Extra endgroup.
document ->endgroup
ifx @unusedoptionlist @empty else @latex@warning@...
l.46 begin{document}
The document class is:
documentclass[lineno]{biometrika}
and I get this error when using both TeXShop and TeX Studio. I have also recently upgraded to Big Sur iOS, and both my TexShop (TeXLive 2020) and TeX Studio are the latest versions.
This is followed by a host of other red flags. I am not very savvy in LaTeX, and would like to seek help on how to solve this problem.
Any help is highly appreciated. Thank you.

egreg · Answer

The biometrika class does several nasty things, the worst of which are redefining document and enddocument for no apparent reason.
This makes it incompatible with the current LaTeX kernel. But you can fix it.
%%% save the original kernel definitions
letlatexarabicarabic
letlatexdocumentdocument
letlatexenddocumentenddocument

%%% fix for bad usage of ntheorem
RequirePackage[thmmarks]{ntheorem}
makeatletter
renewtheoremstyle{plain} 
  {item[hskiplabelsep theorem@headerfont ##1 textup{##2}theorem@separator]} 
  {item[hskiplabelsep theorem@headerfont ##1 textup{##2} (##3)theorem@separator]}
makeatother

%%% now we can load the class

%documentclass[manuscript]{biometrika}
documentclass[
  supplementary,
  lineno
]{biometrika}

%%% recover the original definitions
letdocumentlatexdocument
letenddocumentlatexenddocument
AtEndDocument{printhistory}
letarabiclatexarabic
defrm{}

%%% now we can go on with the rest of the document

Remember to never use rm in your document, which I'm sure you don't, because the command has been deprecated for more than 25 years.
Related: Biometrika journal style file not getting along with TeXLive-2020

Extra endgroup when using the Biometrika template

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