If both boxes clicked, I get the following message, otherwise, if I don't click the "optional" box, it just hangs.
Cannot complete the install because one or more required items could not be found.
  Software being installed: m2e - slf4j over logback logging (Optional) 1.0.100.20110804-1717 (org.eclipse.m2e.logback.feature.feature.group 1.0.100.20110804-1717)
  Missing requirement: Maven Project Model
 Edit Bundle 1.0.0.20110607-2117 (org.eclipse.m2e.model.edit 1.0.0.20110607-2117) requires 'bundle org.eclipse.emf.ecore 0.0.0' but it could not be found
  Missing requirement: Maven Project Model Edit Bundle 1.0.100.20110804-1717 (org.eclipse.m2e.model.edit 1.0.100.20110804-1717) requires 'bundle org.eclipse.emf.ecore 0.0.0' but it could not be found
  Missing requirement: Maven Project Model Edit Bundle 1.0.200.20111228-1245 (org.eclipse.m2e.model.edit 1.0.200.20111228-1245) requires 'bundle org.eclipse.emf.ecore 0.0.0' but it could not be found
  Cannot satisfy dependency:
    From: Maven Integration for Eclipse 1.0.0.20110607-2117 (org.eclipse.m2e.core.ui 1.0.0.20110607-2117)
    To: bundle org.eclipse.m2e.model.edit [1.0.0,1.1.0)
  Cannot satisfy dependency:
 
   From: Maven Integration for Eclipse 1.0.100.20110804-1717 (org.eclipse.m2e.core.ui 1.0.100.20110804-1717)
    To: bundle org.eclipse.m2e.model.edit [1.0.0,1.1.0)
  Cannot satisfy dependency:
    From: Maven Integration for Eclipse 1.0.200.20111228-1245 (org.eclipse.m2e.core.ui 1.0.200.20111228-1245)
    To: bundle org.eclipse.m2e.model.edit [1.0.0,1.1.0)
  Cannot satisfy dependency:
    From: m2e logback appender 1.0.100.20110804-1717 (org.eclipse.m2e.logback.appender 1.0.100.20110804-1717)
    To: bundle org.eclipse.m2e.core.ui [1.0.0,1.1.0)
  Cannot satisfy dependency:
    From: m2e - slf4j over logback logging (Optional) 1.0.100.20110804-1717
 (org.eclipse.m2e.logback.feature.feature.group 1.0.100.20110804-1717)
    To: org.eclipse.m2e.logback.appender [1.0.100.20110804-1717]
Any thoughts appreciated.