title: AMPL IDE usage issue
body: <p>I want to use AMPL student version. 
  also I apply its IDE for mathematical modelling, but when I open it, it pop-up a box showing the following message. </p>
  
  <p><code>
  A valid AMPL license file could not be found for this machine.
  For assistance, copy this entire message and send it to licensing@ampl.com.
  Details:
  License file ampl.lic not found anywhere in $PATH.
  </code></p>
  
  <p>What can I do to fix this issue?</p>