How do I remove old version of plugins in Eclipse Indigo

Question

I'm trying to update my plugins but when I do I get the following. It seems as though I need to delete older version of the plugins before I can update. However, searching in the eclipse folders (configuration, dropins, p2, plugins, features) does not find any files related to the older plugins. What do I need to do to solve this?

Cannot complete the install because of a conflicting dependency.
  Software being installed: XSD - XML Schema Definition Model 2.7.0.v20110606-0949 (org.eclipse.xsd.feature.group 2.7.0.v20110606-0949)
  Software currently installed: Oracle Coherence Tools 1.7.3.201107052022 (oracle.eclipse.tools.helios.coherence.feature.group 1.7.3.201107052022)
  Software currently installed: Eclipse Java Development Tools 3.6.2.r362_v20101117-0800-7z8XFW6FLFlmjJcvz03jyeFBLS_F (org.eclipse.jdt.feature.group 3.6.2.r362_v20101117-0800-7z8XFW6FLFlmjJcvz03jyeFBLS_F)
  Only one of the following can be installed at once: 
    Debug Core 3.7.0.v20110518 (org.eclipse.debug.core 3.7.0.v20110518)
    Debug Core 3.6.0.v20100519 (org.eclipse.debug.core 3.6.0.v20100519)
  Only one of the following can be installed at once: 
    Eclipse Preferences Mechanism 3.3.0.v20100503 (org.eclipse.equinox.preferences 3.3.0.v20100503)
    Eclipse Preferences Mechanism 3.4.1.R37x_v20110725 (org.eclipse.equinox.preferences 3.4.1.R37x_v20110725)
    Eclipse Preferences Mechanism 3.4.0.v20110502 (org.eclipse.equinox.preferences 3.4.0.v20110502)
  Cannot satisfy dependency:
    From: Oracle Coherence Tools UI 3.2.3.201107052022 (oracle.eclipse.tools.coherence.ui 3.2.3.201107052022)
    To: bundle org.eclipse.debug.core [3.6.0,3.7.0)

Answer 1

Looks like the problem is here:

  Cannot satisfy dependency:
    From: Oracle Coherence Tools UI 3.2.3.201107052022 (oracle.eclipse.tools.coherence.ui 3.2.3.201107052022)
    To: bundle org.eclipse.debug.core [3.6.0,3.7.0)

The version of the Oracle Coherence Tools UI you're trying to install is built for Eclipse 3.6 (Helios), but you're running Eclipse 3.7 (Indigo).

Perhaps there's a later version of the plugin you could use? If not, you might have to revert to an older version of Eclipse.