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CCS 5.2.1 : Can't install plugin "protobuf-gt"

Hi !

I tried to install the Eclipse plugin "protobuf-gt" from the Eclipse Marketplace but I had the following error:

Cannot complete the install because one or more required items could not be found.
Software being installed: Protocol Buffer Editor 1.3.2.201207081052 (com.google.eclipse.protobuf.feature.group 1.3.2.201207081052)
Missing requirement: Protocol Buffer Editor 1.3.2.201207081052 (com.google.eclipse.protobuf.feature.group 1.3.2.201207081052) requires 'org.eclipse.emf.ecore 0.0.0' but it could not be found

I also tried the procedure on this page, through the "Install New Software...", but I had the following error while installing Xtext:

Cannot complete the install because one or more required items could not be found.
Software being installed: Xbase 2.3.0.v201206120633 (org.eclipse.xtext.xbase.feature.group 2.3.0.v201206120633)
Missing requirement: Xtext 2.0.1.v201108020636 (org.eclipse.xtext 2.0.1.v201108020636) requires 'bundle org.eclipse.emf.ecore.xmi 0.0.0' but it could not be found
Missing requirement: Xtext 2.1.1.v201111141332 (org.eclipse.xtext 2.1.1.v201111141332) requires 'bundle org.eclipse.emf.common 0.0.0' but it could not be found
Missing requirement: Xtext 2.2.1.v201112130541 (org.eclipse.xtext 2.2.1.v201112130541) requires 'bundle org.eclipse.emf.common 0.0.0' but it could not be found
Missing requirement: Xtext 2.3.0.v201206120633 (org.eclipse.xtext 2.3.0.v201206120633) requires 'bundle org.eclipse.emf.ecore.xmi [2.5.0,3.0.0)' but it could not be found
Missing requirement: Xtext 2.3.1.v201208210947 (org.eclipse.xtext 2.3.1.v201208210947) requires 'bundle org.eclipse.emf.ecore.xmi 2.5.0' but it could not be found
Cannot satisfy dependency:
From: Xtext Junit4 Support 2.3.0.v201206120633 (org.eclipse.xtext.junit4 2.3.0.v201206120633)
To: bundle org.eclipse.xtext 2.0.0
Cannot satisfy dependency:
From: Xtext Junit4 Support 2.3.1.v201208210947 (org.eclipse.xtext.junit4 2.3.1.v201208210947)
To: bundle org.eclipse.xtext 2.0.0
Cannot satisfy dependency:
From: Xbase 2.3.0.v201206120633 (org.eclipse.xtext.xbase.feature.group 2.3.0.v201206120633)
To: org.eclipse.xtext.xbase.junit [2.3.0.v201206120633]
Cannot satisfy dependency:
From: Xbase Junit support 2.3.0.v201206120633 (org.eclipse.xtext.xbase.junit 2.3.0.v201206120633)
To: bundle org.eclipse.xtext.junit4 2.3.0

Can you help me install this plugin ?

Thanks,
Benoit