在使用 PdfLaTeX 进行编译时，下面的 MWE 会生成以下错误I do not know the keys /tcb/flush right upper。为了解决这个问题，我下载tcolorbox了pgfkeys我加拿大运输安全局并将它们放在我的 TeX 安装文件夹中（因为 TeXLive 现在已冻结）并运行texhash并更新系统。但我在这里仍然得到同样的结果。还有其他方法可以实现相同的效果吗？
\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{skins}
\tcbset{
pccstyle/.style={
enhanced,flushright upper,
boxrule=1.4pt,
colback=white,colframe=black!50!yellow,
drop fuzzy midday shadow=black!50!yellow
}
}
\pagestyle{empty}
\begin{document}
\vspace*{1cm}
\mbox{}\hfill\scalebox{2}{
\begin{tcolorbox}[pccstyle,width=6.8cm]
{\bfseries\LARGE {Program Review} \par}
{\large \itshape Mathematics \par}
{\large Portland Community College }
\end{tcolorbox}
}
\scalebox{2}{%
\begin{tcolorbox}[pccstyle,width=4.8cm]
{\scshape Fall 2008--Spring 2013}
\end{tcolorbox}
}
\end{document}
输出\listfiles：
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
tcolorbox.sty 2013/05/15 version 2.22 text color boxes
pgf.sty 2013/12/18 v3.0.0 (rcs-revision 1.14)
pgfrcs.sty 2013/12/20 v3.0.0 (rcs-revision 1.28)
everyshi.sty 2001/05/15 v3.00 EveryShipout Package (MS)
pgfrcs.code.tex
pgfcore.sty 2010/04/11 v3.0.0 (rcs-revision 1.7)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
pgfsys.sty 2013/11/30 v3.0.0 (rcs-revision 1.47)
pgfsys.code.tex
pgfsyssoftpath.code.tex 2013/09/09 (rcs-revision 1.9)
pgfsysprotocol.code.tex 2006/10/16 (rcs-revision 1.4)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
pgfcore.code.tex
pgfcomp-version-0-65.sty 2007/07/03 v3.0.0 (rcs-revision 1.7)
pgfcomp-version-1-18.sty 2007/07/23 v3.0.0 (rcs-revision 1.1)
verbatim.sty 2003/08/22 v1.5q LaTeX2e package for verbatim enhancements
tikz.sty 2013/12/13 v3.0.0 (rcs-revision 1.142)
pgffor.sty 2013/12/13 v3.0.0 (rcs-revision 1.25)
pgfkeys.sty
pgfkeys.code.tex
pgfmath.sty
pgfmath.code.tex
pgffor.code.tex
tikz.code.tex
supp-pdf.mkii
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
epstopdf-base.sty 2010/02/09 v2.5 Base part for package epstopdf
grfext.sty 2010/08/19 v1.1 Manage graphics extensions (HO)
kvdefinekeys.sty 2011/04/07 v1.3 Define keys (HO)
kvoptions.sty 2011/06/30 v3.11 Key value format for package options (HO)
kvsetkeys.sty 2012/04/25 v1.16 Key value parser (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
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