title: How install an Emacs package from file
body: <p>I have Emacs installed on an internal PC in the organization that is not open  to the Internet.</p>
  
  <p>For the sake of that question I'd like to install the "auto-complete" package.</p>
  
  <p>I have downloaded a tar file from MELPA and a zip file from GitHub and copied them to my organization PC.</p>
  
  <p>Now how can I install the auto-complete package using either the tar or zip file?</p>
  
  <p>By the way I see in MELPA that the auto-complete package depends on the 
  pop-up 0.5.0 package.</p>
  
  <p>Should I install that before?</p>