Your original request has been modified.
  "JavaScript Development Tools" is already installed, so an update will be performed instead.
  "Eclipse JSON Editors and Tools" is already installed, so an update will be performed instead.
Cannot complete the install because of a conflicting dependency.
  Software being installed: Eclipse JSON Editors and Tools 1.1.2.v201804101953 (org.eclipse.wst.json_ui.feature.feature.group 1.1.2.v201804101953)
  Software currently installed: Eclipse Web Developer Tools 3.9.2.v201802261859 (org.eclipse.wst.web_ui.feature.feature.group 3.9.2.v201802261859)
  Only one of the following can be installed at once: 
    Eclipse JSON Editors and Tools 1.1.2.v201804101953 (org.eclipse.wst.json_ui.feature.feature.jar 1.1.2.v201804101953)
    Eclipse JSON Editors and Tools 1.1.0.v201704192002 (org.eclipse.wst.json_ui.feature.feature.jar 1.1.0.v201704192002)
    Eclipse JSON Editors and Tools 1.0.0.v201609072018 (org.eclipse.wst.json_ui.feature.feature.jar 1.0.0.v201609072018)
    Eclipse JSON Editors and Tools 3.8.0.v201601291607 (org.eclipse.wst.json_ui.feature.feature.jar 3.8.0.v201601291607)
    Eclipse JSON Editors and Tools 1.0.0.v201603042101 (org.eclipse.wst.json_ui.feature.feature.jar 1.0.0.v201603042101)
    Eclipse JSON Editors and Tools 1.0.0.v201604280217 (org.eclipse.wst.json_ui.feature.feature.jar 1.0.0.v201604280217)
    Eclipse JSON Editors and Tools 1.0.0.v201605251755 (org.eclipse.wst.json_ui.feature.feature.jar 1.0.0.v201605251755)
    Eclipse JSON Editors and Tools 1.1.2.v201802171654 (org.eclipse.wst.json_ui.feature.feature.jar 1.1.2.v201802171654)
  Cannot satisfy dependency:
    From: Eclipse JSON Editors and Tools 1.1.2.v201802171654 (org.eclipse.wst.json_ui.feature.feature.group 1.1.2.v201802171654)
    To: org.eclipse.equinox.p2.iu; org.eclipse.wst.json_ui.feature.feature.jar [1.1.2.v201802171654,1.1.2.v201802171654]
  Cannot satisfy dependency:
    From: Eclipse JSON Editors and Tools 1.1.2.v201804101953 (org.eclipse.wst.json_ui.feature.feature.group 1.1.2.v201804101953)
    To: org.eclipse.equinox.p2.iu; org.eclipse.wst.json_ui.feature.feature.jar [1.1.2.v201804101953,1.1.2.v201804101953]
  Cannot satisfy dependency:
    From: Eclipse Web Developer Tools 3.9.2.v201802261859 (org.eclipse.wst.web_ui.feature.feature.group 3.9.2.v201802261859)
    To: org.eclipse.equinox.p2.iu; org.eclipse.wst.json_ui.feature.feature.group [1.1.2.v201802171654,1.1.2.v201802171654]