title: Error installing .zip file with R package or library
body: <p>I am trying to install the R package <code>MixeR</code> 2003 by Batagelj and Bren . This is not in CRAN, but is accessible on <a href="http://vlado.fmf.uni-lj.si/pub/MixeR/" rel="nofollow noreferrer">this website</a> as a downloadable zip file containing an R file (<code>MixeR.R</code>), a dataset (<code>Glac.dat</code>) and 3 pdf's.</p>
  
  <p>I downloaded the zip file, and placed it in my R directory. After that, I attempted to install it from within RStudio using the drop-down menus <code>Tools &gt; Install Packages &gt; Package Archive File (.zip; .tar.gz) &gt; MixeR.zip</code>, getting the following error message:</p>
  
  <blockquote>
    <p>install.packages("~/R/MixeR.zip", repos = NULL, type = "win.binary")</p>
    
    <p>Installing package into ‘C:/Users/Documents/R/win-library/3.3’</p>
    
    <p>(as ‘lib’ is unspecified)</p>
    
    <p>Warning in install.packages :
      cannot open compressed file 'MixeR/DESCRIPTION', probable reason 'No such file or directory'</p>
    
    <p>Error in install.packages : cannot open the connection</p>
  </blockquote>
  
  <p>What am I doing wrong, and how can I install this package?</p>
  
  <p>It may very well be that it is actually not a package, but rather a 'library', in which case I would appreciate guidance as to how to make the functions and datasets in it accessible to the R session.</p>