title: Eclipse Photon cannot complete the install because of a conflicting dependency
body: <p>On Windows 10 I upgraded from Eclipse Oxygen to Photon a few days ago. Today I asked it to check for updates, and it told me this:</p>
  
  <pre><code>Cannot complete the install because of a conflicting dependency.
    Software being installed: Eclipse XML Editors and Tools 3.10.0.v201804210200 (org.eclipse.wst.xml_ui.feature.feature.group 3.10.0.v201804210200)
    Software currently installed: Eclipse Java Web Developer Tools 3.9.0.v201803221834 (org.eclipse.jst.web_ui.feature.feature.group 3.9.0.v201803221834)
    Only one of the following can be installed at once: 
      DTD Editor infopops 1.0.400.v201707252002 (org.eclipse.wst.dtd.ui.infopop 1.0.400.v201707252002)
      DTD Editor infopops 1.0.400.v201309112106 (org.eclipse.wst.dtd.ui.infopop 1.0.400.v201309112106)
      DTD Editor infopops 1.0.400.v201711201733 (org.eclipse.wst.dtd.ui.infopop 1.0.400.v201711201733)
    Cannot satisfy dependency:
      From: Eclipse Java Web Developer Tools 3.9.0.v201803221834 (org.eclipse.jst.web_ui.feature.feature.group 3.9.0.v201803221834)
      To: org.eclipse.equinox.p2.iu; org.eclipse.wst.ws_ui.feature.feature.group [3.8.1.v201803221834,3.8.1.v201803221834]
    Cannot satisfy dependency:
      From: Web Services Tools 3.8.1.v201803221834 (org.eclipse.wst.ws_ui.feature.feature.group 3.8.1.v201803221834)
      To: org.eclipse.equinox.p2.iu; org.eclipse.wst.xml_ui.feature.feature.group [3.9.2.v201803221834,3.9.2.v201803221834]
    Cannot satisfy dependency:
      From: Eclipse XML Editors and Tools 3.10.0.v201804210200 (org.eclipse.wst.xml_ui.feature.feature.group 3.10.0.v201804210200)
      To: org.eclipse.equinox.p2.iu; org.eclipse.wst.dtd.ui.infopop [1.0.400.v201711201733,1.0.400.v201711201733]
    Cannot satisfy dependency:
      From: Eclipse XML Editors and Tools 3.9.2.v201803221834 (org.eclipse.wst.xml_ui.feature.feature.group 3.9.2.v201803221834)
      To: org.eclipse.equinox.p2.iu; org.eclipse.wst.dtd.ui.infopop [1.0.400.v201707252002,1.0.400.v201707252002]
  </code></pre>
  
  <p>Before this I get an error <code>'Searching alternate solutions…' has encountered a problem.</code> with <code>No remedy found</code> in the dialog.</p>
  
  <p>What do I do now?</p>