Cannot complete install if PDT already installed

What steps will reproduce the problem?
1.Follow install instructions on Helios with PDT already installed.

What is the expected output? What do you see instead?

Expected to install the plugin but receive this instead....

Cannot complete the install because of a conflicting dependency.
  Software being installed: Protocol Buffer Editor 1.3.3.201210291557 (com.google.eclipse.protobuf.feature.group 1.3.3.201210291557)
  Software currently installed: PHP Development Tools (PDT) SDK Feature 2.2.1.v20101001-2300-53184QAN4JBQgLYPWMLcXn6Na9Od (org.eclipse.php.sdk.feature.group 2.2.1.v20101001-2300-53184QAN4JBQgLYPWMLcXn6Na9Od)
  Only one of the following can be installed at once: 
    Core File Systems 1.3.100.v20110423-0524 (org.eclipse.core.filesystem 1.3.100.v20110423-0524)
    Core File Systems 1.3.0.v20100526-0737 (org.eclipse.core.filesystem 1.3.0.v20100526-0737)
    Core File Systems 1.3.1.R36x_v20100727-0745 (org.eclipse.core.filesystem 1.3.1.R36x_v20100727-0745)
  Cannot satisfy dependency:
    From: Protocol Buffer Editor 1.3.3.201210291557 (com.google.eclipse.protobuf.feature.group 1.3.3.201210291557)
    To: org.eclipse.core.filesystem 1.3.100
  Cannot satisfy dependency:
    From: Dynamic Languages Toolkit - Core Frameworks 2.0.0.v20100518-1923-7L--EAAoOVMSMc4AWEvJ (org.eclipse.dltk.core.feature.group 2.0.0.v20100518-1923-7L--EAAoOVMSMc4AWEvJ)
    To: org.eclipse.platform.feature.group 3.4.0
  Cannot satisfy dependency:
    From: Dynamic Languages Toolkit - Core Frameworks 2.0.0.v20100518-1923-7L-0EAAoOVMSUaEAZ8w_ (org.eclipse.dltk.core.feature.group 2.0.0.v20100518-1923-7L-0EAAoOVMSUaEAZ8w_)
    To: org.eclipse.platform.feature.group 3.4.0
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) Runtime Feature 2.2.1.v20101001-2300-7L7J1F8NcJTJTJJT9cmJJ (org.eclipse.php.feature.group 2.2.1.v20101001-2300-7L7J1F8NcJTJTJJT9cmJJ)
    To: org.eclipse.dltk.core.feature.group [2.0.0,3.0.0)
  Cannot satisfy dependency:
    From: PHP Development Tools (PDT) SDK Feature 2.2.1.v20101001-2300-53184QAN4JBQgLYPWMLcXn6Na9Od (org.eclipse.php.sdk.feature.group 2.2.1.v20101001-2300-53184QAN4JBQgLYPWMLcXn6Na9Od)
    To: org.eclipse.php.feature.group [2.2.1.v20101001-2300-7L7J1F8NcJTJTJJT9cmJJ]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.6.0.v20100602-9gF78GpqFt6trOGhL60z0oEx3fz-JKNwxPY (org.eclipse.platform.feature.group 3.6.0.v20100602-9gF78GpqFt6trOGhL60z0oEx3fz-JKNwxPY)
    To: org.eclipse.core.filesystem [1.3.0.v20100526-0737]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L (org.eclipse.platform.feature.group 3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L)
    To: org.eclipse.core.filesystem [1.3.1.R36x_v20100727-0745]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.6.2.r362_v20110210-9gF78Gs1FrIGnHDHWkEcopoN8AmxeZflGDGKQi (org.eclipse.platform.feature.group 3.6.2.r362_v20110210-9gF78Gs1FrIGnHDHWkEcopoN8AmxeZflGDGKQi)
    To: org.eclipse.core.filesystem [1.3.1.R36x_v20100727-0745]

What version of the product are you using? On what operating system?
Eclipse Helios, Windows XP

Following eclipse plugins installed:
  Adobe Flash Builder Core Feature  4.0.1.277662    com.adobe.flexbuilder.feature.core.feature.group
  Adobe Flash Builder Localized Core Feature    4.0.1.277662    com.adobe.flexbuilder.feature.core.nl1.feature.group
  Aptana Studio 3 Plugin    3.2.2.201208200959-7C7C37EAEI9YFMKNDc1bIClwcOi- com.aptana.feature.studio.feature.group
  CollabNet Merge Client    2.1.0   com.collabnet.subversion.merge.feature.feature.group
  Common Flex IDE Feature   4.0.1.277662    com.adobe.flexide.feature.feature.group
  Common Flex IDE Utility Feature   4.0.1.277662    com.adobe.flexide.utils.feature.feature.group
  Eclipse IDE for Java EE Developers    1.3.0.20100617-0521 epp.package.jee
  JavaScript Development Tools  1.2.5.v201109150410-7E79FICFBBoPbWQsbUQ1Vw  org.eclipse.wst.jsdt.feature.feature.group
  JessDE    7.1.0   gov.sandia.jess.feature.group
  JNA Library   3.2.3   com.sun.jna.feature.group
  Localized common feature  4.0.1.277662    com.adobe.flexide.feature.nl1.feature.group
  ObjectAid Class Diagram   1.0.9   com.objectaid.uml.feature.group
  ObjectAid Sequence Diagram    1.0.9   com.objectaid.uml.seq.feature.group
  OpenExtern    1.0.3   hr.ja.penextern_feature.feature.group
  PHP Development Tools (PDT) SDK Feature   2.2.1.v20101001-2300-53184QAN4JBQgLYPWMLcXn6Na9Od   org.eclipse.php.sdk.feature.group
  Subclipse (Required)  1.6.13  org.tigris.subversion.subclipse.feature.group
  Subversion Client Adapter (Required)  1.6.12  org.tigris.subversion.clientadapter.feature.feature.group
  Subversion JavaHL Native Library Adapter (Required)   1.6.12  org.tigris.subversion.clientadapter.javahl.feature.feature.group
  Subversion Revision Graph 1.0.8   org.tigris.subversion.subclipse.graph.feature.feature.group
  SVNKit Client Adapter (Not required)  1.6.12  org.tigris.subversion.clientadapter.svnkit.feature.feature.group
  SVNKit Library    1.3.3.6648  org.tmatesoft.svnkit.feature.group
  Xbase 2.3.0.v201206120633 org.eclipse.xtext.xbase.feature.group
  Xtext Documentation   2.3.0.v201206120633 org.eclipse.xtext.docs.feature.group
  Xtext Examples    2.3.0.v201206120633 org.eclipse.xtext.examples.feature.group
  Xtext Runtime 2.3.0.v201206120633 org.eclipse.xtext.runtime.feature.group
  Xtext SDK 2.3.0.v201206120633 org.eclipse.xtext.sdk.feature.group
  Xtext UI  2.3.0.v201206120633 org.eclipse.xtext.ui.feature.group
  YourKit Java Profiler 9.5.6 Plugin    9.5.6.9540  com.yourkit.profiler.feature.group

Please provide any additional information below.
Original issue reported on code.google.com by Michael....@gmail.com on 8 Nov 2012 at 1:16
duckAsteroid / protobuf-dt

Cannot complete install if PDT already installed #231
