ありがとうございます。別途でダウンロードが必要だったのですね。
ダウンロードして、解決できました。
しかし、新たに問題点が生じました。
プリアンブルに\usepackage{tcolorbox}を入れると、エラーが出るのです。
(以下のようなものをタイプセットしました)
\documentclass[uplatex,dvipdfmx,a4paper,11pt,twoside]{jsarticle}
\usepackage{emathBk}
\usepackage{tcolorbox}
\begin{document}
a
\begin{tyuukai}
あああああああああああああああああああああああああああああああああああああ
\tyuu{いいいいいいいいいいいいいいいいい}
うううううううううううう
\end{tyuukai}
a
\end{document}
エラー内容は
Missing number, treated as zero
illegal unit of measure (pt inserted)
で、ログは以下のとおりです
Multiple filename arguments? OK, I'll take the latter one.
Multiple filename arguments? OK, I'll take the latter one.
Multiple filename arguments? OK, I'll take the latter one.
This is ptex2pdf[.lua] version 20200520.0.
Processing /Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用
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entering extended mode
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No file テスト用.aux.
Overfull \hbox (3.0pt too wide) in paragraph at lines 13--13
| || []
Overfull \hbox (9.24683pt too wide) in paragraph at lines 13--13
[][]
/Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用.tex:20: Missing number, treated as zero.
<to be read again>
\advance
l.20 \end{document}
/Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用.tex:20: Illegal unit of measure (pt inserted).
<to be read again>
\advance
l.20 \end{document}
/Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用.tex:20: Missing number, treated as zero.
<to be read again>
\advance
l.20 \end{document}
/Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用.tex:20: Illegal unit of measure (pt inserted).
<to be read again>
\advance
l.20 \end{document}
[1] (./テスト用.aux) )
(see the transcript file for additional information)
Output written on テスト用.dvi (1 page, 1200 bytes).
SyncTeX written on テスト用.synctex.gz.
Transcript written on テスト用.log.
ptex2pdf processing of /Users/mac/Documents/大学入試教材/数学/大学入試数学tex/テスト用 failed.