Cannot complete the install because one or more required items could not be found.
  Software being installed: Smarty Feature 0.10.0.201707132003 (org.eclipse.php.smarty_feature.feature.group 0.10.0.201707132003)
  Software currently installed: PHP Development Tools (PDT) 4.3.2.201706231408 (org.eclipse.php.feature.group 4.3.2.201706231408)
  Missing requirement: DLTK Code Manipulation Functionality 5.9.0.201805232010 (org.eclipse.dltk.core.manipulation 5.9.0.201805232010) requires 'bundle org.eclipse.ltk.core.refactoring 3.9.0' but it could not be found
  Only one of the following can be installed at once: 
    PDT Help Plug-in 4.3.0.201703131616 (org.eclipse.php.help 4.3.0.201703131616)
    PDT Help Plug-in 6.0.0.201805272250 (org.eclipse.php.help 6.0.0.201805272250)
    PDT Help Plug-in 4.1.0.201609140517 (org.eclipse.php.help 4.1.0.201609140517)
    PDT Help Plug-in 5.3.0.201803070838 (org.eclipse.php.help 5.3.0.201803070838)
    PDT Help Plug-in 4.2.0.201611142355 (org.eclipse.php.help 4.2.0.201611142355)
    PDT Help Plug-in 4.3.0.201703072355 (org.eclipse.php.help 4.3.0.201703072355)
    PDT Help Plug-in 4.3.2.201706231408 (org.eclipse.php.help 4.3.2.201706231408)
    PDT Help Plug-in 4.0.0.201606081033 (org.eclipse.php.help 4.0.0.201606081033)
  Cannot satisfy dependency:
    From: Dynamic Languages Toolkit - Core Frameworks 5.9.0.201805232010 (org.eclipse.dltk.core.feature.group 5.9.0.201805232010)
    To: org.eclipse.dltk.core.manipulation [5.9.0.201805232010]
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) 4.3.2.201706231408 (org.eclipse.php.feature.group 4.3.2.201706231408)
    To: org.eclipse.php.help [4.3.2.201706231408]
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) 5.3.0.201803070838 (org.eclipse.php.feature.group 5.3.0.201803070838)
    To: org.eclipse.php.help [5.3.0.201803070838]
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) 6.0.0.201805272250 (org.eclipse.php.feature.group 6.0.0.201805272250)
    To: org.eclipse.dltk.core.feature.group 5.9.0
  Cannot satisfy dependency:
    From: Smarty Feature 0.10.0.201707132003 (org.eclipse.php.smarty_feature.feature.group 0.10.0.201707132003)
    To: org.eclipse.php.feature.group 5.0.0