title: LaTeX error related to tcolorbox.sty not found
body: <p>I have a problem with LaTeX whenever I try to download the file in PDF. 
  When I try to do that, it gives me the following error:</p>
  
  <pre><code>! LaTeX Error: File `tcolorbox.sty' not found.
  Type X to quit or &lt;RETURN&gt; to proceed ,or enter new name.
  (Default extension: sty)Enter file name:! Emergency stop.&lt;read &gt; \usepackage
  </code></pre>
  
  <p>I've already downloaded the <em>tcolorbox</em> zip file and dragged the directory into the tex/latex tree, as said in README file, but neither that worked. </p>
  
  <p>Originally I used to try to download the pdf from Jupiter Notebook, but also that gave me an error:</p>
  
  <pre><code>nbconvert failed: PDF creating failed, captured latex output:
  Failed to run "xelatex .\notebook.tex -quiet" command:
  This is XeTeX, Version 3.14159265-2.6-0.999991 (TeX Live 2019/W32TeX) (preloaded format=xelatex)
   restricted \write18 enabled.
  entering extended mode
  ! Undefined control sequence.
  &lt;*&gt; .\notebook
                .tex -quiet
  ? 
  ! Emergency stop.
  &lt;*&gt; .\notebook
                .tex -quiet
  No pages of output.
  Transcript written on ?.
  </code></pre>
  
  <p>Any suggestions?</p>