Please update your system to include revtex4-1.cls

Question

I am writing an article, references of which are to be written in AAS style. Now, when I added {aastex631} in the document class, it downloaded some class files. However, on compilation it showed the following the error-"Please update your system to include revtex4-1.cls" in both TeXworks and WinEdt 10.
Though I'm a newbie in LaTeX, I updated everything I could, from my system to MiKTex updates. On someone's advice, I even copied all the contents of REVTeX.zip in the local tree directory and in the folder containing tex file of the article. But the error is still there.

Ulrike Fischer · Answer

revtex4-1 is here https://ctan.org/pkg/revtex4-1, but you will have to unpack the dtx to get the cls.
You could instead try to substitute the class:
makeatletter
declare@file@substitution{revtex4-1.cls}{revtex4-2.cls}
makeatother

documentclass{aastex631}
begin{document}
abc
end{document}

In any case write to the maintainer of the aastex631 class and ask them not to use an obsolete class.

Please update your system to include revtex4-1.cls

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