title: how can I install package from a downloaded zip
body: <p>I am behind a firewall on MS Windows and setting the proxy in my init file did not work. I can download the zip archive from GitHub, but when the package has many <code>.el</code> files the <code>install-from-file</code> does not work. I tried saving the folder as <code>.tar</code> but it still did not work.</p>
  <p>How can I install the downloaded folder? There is a <code>Makefile</code> in the folder, but I have no <code>make</code> or its alternatives on Windows and will not be allowed to install them.</p>
  <p>Prior to the migration to GitHub I was able to download a single file from Melpa and that worked fine.</p>