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<div class="moz-cite-prefix">On 6/9/20 11:15 AM, Bernt Lie wrote:<br>
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<p class="MsoPlainText"><span lang="EN-US">I installed LyX 2.3.5
a couple of days ago (?), and it worked fine. (Windows 10
64bit, latest version.)<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US">Today,
one of my students tried to install some template for LyX
2.3.5, and messed around with MikTeX. But in the end that
didn't work. So in the end, I uninstalled MikTeX, Inkscape,
and LyX, and re-installed the programs.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US">Now
I get this error message:<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><img
style="width:3.6979in;height:2.6458in"
id="Picture_x0020_1"
src="cid:part1.6DB06848.824443F5@gmail.com" class=""
width="355" height="254"></span><span style="color:black"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US">When
I try to open a template.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoPlainText" style="color:black;mso-list:l0 level1
lfo1"><span lang="EN-US">What has gone wrong? Why is
“extarticle.cls” missing?<o:p></o:p></span></li>
<li class="MsoPlainText" style="color:black;mso-list:l0 level1
lfo1"><span lang="EN-US">How can I fix it?<o:p></o:p></span></li>
</ul>
<p class="MsoPlainText"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black" lang="EN-US">-B<o:p></o:p></span></p>
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Oops! I inadvertently replied to Bernt offline, suggesting that the
extsizes package had not been installed. Pasting in his reply:<br>
<br>
<blockquote type="cite"> did nothing special to include specific
packages a couple of days ago, and nothing special today.</blockquote>
It's been quite a while since I used MikTeX, but I vaguely recall
that installation options included a modest size package with common
classes and something of an omnibus installation with all sorts of
packages (and a large footprint). Bernt, is it possible that you did
a full installation in the case that the document class was
available and a smaller installation in the case where it was not?<br>
<br>
I'm assuming here that basic classes (such as article.cls) remain
available even when extarticle.cls does not.<br>
<br>
Paul<br>
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