title: Qt Creator 2.6.2 and Qt 4.8.4: Qt version is not properly installed
body: <p>Windows 7: I have installed Qt 4.8.4 Win and Qt Creator 2.6.2 Win, VS2010 (<a href="http://qt-project.org/downloads#qt-other" rel="nofollow noreferrer">from here</a>). When I try to open a project (previously compiled with Qt 4.8.3 / Creator 2.5.2), it says I need a kit (<code>no valid kit</code>) and eventually I end up at <code>Qt version is not properly installed</code>. All is shown in the screenshots below.</p>
  
  <p>I have checked some solutions:</p>
  
  <ol>
  <li>SO <a href="https://stackoverflow.com/questions/14581528/qt-version-is-not-properly-installed-please-run-make-install">QT version is not properly installed, please run make install</a> is for Linux</li>
  <li>Some say, I need to install Qt SDK, <a href="http://qt-project.org/downloads#qt-other" rel="nofollow noreferrer">but where do I find this</a> (this one contains <a href="http://www.developer.nokia.com/info/sw.nokia.com/id/da8df288-e615-443d-be5c-00c8a72435f8/Qt_SDK.html" rel="nofollow noreferrer">older Creator / Qt versions</a>), and what sense would the individual installers make if I need SDK?</li>
  <li>Some say, I need to add Qt to path, but what exactly? Creator? The Qt 4.8.4, the <code>qmake</code> dir?</li>
  <li>Somehow I fail with this <code>make install</code>, nothing happens.</li>
  <li>I have installed the 5.0.1 including Creator 2.6.2 as one installation, this works. But when I then download 4.8.4. and try to add it as QT Version, same issue: <code>Qt version is not properly installed</code></li>
  </ol>
  
  <p>Any idea what I would need to do or install.</p>
  
  <p>-- Edit -- List of trials ---</p>
  
  <ol>
  <li>Added my Qt 4.8.4 and its <code>qmake</code> dir to <code>PATH</code></li>
  <li>Re-installed Qt in different order: Qt 4.8.4 first / Creator 2.6.2 thereafter</li>
  <li>Opened Qt CMD Prompt <code>qmake install</code> (as in the suggestions): <code>4.8.4\install:1: Parse Error ('INSTALLING Qt Source Package Version 4.8.4.') Error processing project file: install</code></li>
  <li><code>qmake install</code> from Qt CMD. Runs 20 minutes, Laptop gets extremly hot, then it crashes</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/tvUdr.png" alt="Configure Kit"></p>
  
  <p><img src="https://i.stack.imgur.com/ELI6y.png" alt="Kit"></p>
  
  <p><img src="https://i.stack.imgur.com/ezHUy.png" alt="Qt version not installed"></p>
  
  <pre><code>P:\Qt\Libs\4.8.4&gt;qmake\qmake.exe install
  QMAKESPEC has not been set, so configuration cannot be deduced.
  Error processing project file: install
  </code></pre>