title: Installing package from a local zip file in R
body: <p>I am trying to install a package in R from a local zip file. I have the zip file on a local drive, but when I go to <em>Packages --> Install a package from a local zip file</em> I get the following warning: </p>
  
  <pre><code>&gt; utils:::menuInstallLocal()
  Error in read.dcf(file.path(pkgname, "DESCRIPTION"), c("Package", "Type")) : cannot open the connection
  </code></pre>
  
  <p>In addition: Warning messages:</p>
  
  <pre><code>1: In unzip(zipname, exdir = dest) : error 1 in extracting from zip file
  2: In read.dcf(file.path(pkgname, "DESCRIPTION"), c("Package", "Type")) : cannot open compressed file 'cirt/DESCRIPTION', probable reason 'No such file or directory'
  </code></pre>
  
  <p>What is going on here?</p>
  
  <p>Many thanks in advance,
  A</p>