title: Could not start Qt-designer
body: <p>On windows7 64bits, I just installed Eric6 in this way :</p>
  
  <ul>
  <li>python -m pip install pyqt5 </li>
  <li>python -m pip install QScintilla</li>
  <li>install.py</li>
  </ul>
  
  <p>I tried to follow their first tutorial LogParser on <a href="https://eric-ide.python-projects.org/tutorials/LogParser/chap2.html" rel="nofollow noreferrer">https://eric-ide.python-projects.org/tutorials/LogParser/chap2.html</a></p>
  
  <p>When coming to create LogParser.ui I get the following error :</p>
  
  <p>Could not start Qt-designer
  Ensure that it is available as ...Python36\lib\site-packages\PyQt5\Qt\bin\designer.exe</p>
  
  <p>When checking there is a folder: C:\Users\Gustav\AppData\Local\Programs\Python\Python36\Lib\site-packages\PyQt5\Qt\bin
  But its not containg any exe file</p>
  
  <p>Any help would be nice !</p>