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<p class="MsoNormal"><span lang="EN-US">So… I have uninstalled both MikTeX and LyX, and try to re-install them.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">With MikTeX, I do the following:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">Choose to install it under directory “C:\\Program_Files\MikTeX\MikTeX_2_9” instead of the default location (“…\AppData\Local\Programs\MikTeX 2.9\”)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">Settings: Preferred paper size – A4, Install missing pagackages on-the-fly: Yes<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">After MikTeX has installed packages, I check for updates. There were 8 updates, which I installed from “A random package repository on the internet”.
<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Next, I install LyX 2.3.5:<o:p></o:p></span></p>
<ol style="margin-top:0in" start="4" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">I install LyX in directory “C:\Program_Files\LyX\LyX_2_3”<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">The LyX installer finds MikTeX at “C:\Program_Files\MikTeX\MikTeX_2_9\miktex\bin\x64”.
<o:p></o:p></span></li></ol>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
<ol style="margin-top:0in" start="6" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">LyX takes some time to install, and downloads some missing packages:<o:p></o:p></span></li></ol>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><img width="492" height="378" style="width:5.125in;height:3.9375in" id="Picture_x0020_2" src="cid:image002.png@01D63F08.59DF8F40"></span><span lang="EN-US"><o:p></o:p></span></p>
<ol style="margin-top:0in" start="7" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span lang="EN-US">When LyX has been installed, I try to open a template. Result:<o:p></o:p></span></li></ol>
<p class="MsoListParagraph"><span lang="EN-US"><img width="338" height="251" style="width:3.5208in;height:2.6145in" id="Picture_x0020_3" src="cid:image003.png@01D63F0C.2F248BD0"></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I do a search for file IEEEtran.cls, and it is there:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><img width="806" height="111" style="width:8.3958in;height:1.1562in" id="Picture_x0020_4" src="cid:image004.png@01D63F0D.8FA7C570"></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Questions:<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="A">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo10"><span lang="EN-US">Why doesn’t LyX find this file?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo10"><span lang="EN-US">Is the problem that I have not chosen the default installation path of LyX and/or MikTeX?<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">BR,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-B<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:NO-BOK">From:</span></b><span lang="EN-US" style="mso-fareast-language:NO-BOK"> lyx-users <lyx-users-bounces@lists.lyx.org>
<b>On Behalf Of </b>Paul A. Rubin<br>
<b>Sent:</b> Tuesday, June 9, 2020 5:50 PM<br>
<b>To:</b> lyx-users@lists.lyx.org<br>
<b>Subject:</b> Re: LyX 2.3.5<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">On 6/9/20 11:15 AM, Bernt Lie wrote:</span><span lang="EN-US" style="mso-fareast-language:NO-BOK"><o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<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 lang="EN-US" style="color:black"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">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.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">Now I get this error message:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><img width="355" height="254" style="width:3.6979in;height:2.6458in" id="Picture_x0020_1" src="cid:image001.png@01D63F01.641F5320"></span><span lang="EN-US">»<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">When I try to open a template.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"> </span><span lang="EN-US"><o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoPlainText" style="color:black;mso-list:l6 level1 lfo9"><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:l6 level1 lfo9"><span lang="EN-US">How can I fix it?<o:p></o:p></span></li></ul>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">-B</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:NO-BOK"><br>
<br>
<o:p></o:p></span></p>
</blockquote>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:NO-BOK">Oops! I inadvertently replied to Bernt offline, suggesting that the extsizes package had not been installed. Pasting in his reply:<br>
<br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:NO-BOK">did nothing special to include specific packages a couple of days ago, and nothing special today.<o:p></o:p></span></p>
</blockquote>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US" style="mso-fareast-language:NO-BOK">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>
</span><span style="mso-fareast-language:NO-BOK">Paul<o:p></o:p></span></p>
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