The installer reports "Cannot complete the request." Here's a truncated bit of the output it shows:

Cannot complete the request. See the details. Unsatisfied dependency: [com.wireframesketcher.feature.group 1.1.1] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.emf.ecore/0.0.0 Unsatisfied dependency: [com.wireframesketcher.feature.group 1.1.1] requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.emf.ecore.xmi/0.0.0 Cannot find a solution where both Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.jdt.feature.jar/[3.4.0.v20080603-2000-7o7tEAXEFpPqqoXxgaBhhhq,3.4.0.v20080603-2000-7o7tEAXEFpPqqoXxgaBhhhq]] and Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.jdt.feature.jar/[3.4.1.r341_v20080709-0800-7o7tEAfEF_U5qyUgrb2HAp539P97,3.4.1.r341_v20080709-0800-7o7tEAfEF_U5qyUgrb2HAp539P97]] can be satisfied. Cannot find a solution where both Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.swt/[3.4.0.v3448f,3.4.0.v3448f]] and Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.swt/[3.4.1.v3449c,3.4.1.v3449c]] can be satisfied. Cannot find a solution where both Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.rcp.feature.jar/[3.4.0.v20080324a-989JERhEk-jWnd5IY8K5tjxB,3.4.0.v20080324a-989JERhEk-jWnd5IY8K5tjxB]] and Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.rcp.feature.jar/[3.4.100.r341_v20080814-989JESIEdAciFYfkZZsBfSwQ2341,3.4.100.r341_v20080814-989JESIEdAciFYfkZZsBfSwQ2341]] can be satisfied. Cannot find a solution where both Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.cvs.feature.jar/[1.1.0.v20080603-7C79E8M9EI99m9c9S,1.1.0.v20080603-7C79E8M9EI99m9c9S]] and Match[requiredCapability: org.eclipse.equinox.p2.iu/org.eclipse.cvs.feature.jar/[1.1.1.r34x_20080902-7C79E8N9nJD4oAW9V1938,1.1.1.r34x_20080902-7C79E8N9nJD4oAW9V1938]] can be satisfied.

And it goes on like that for many more lines.

Ted,

I have the impression that you are using a milestone version of Eclipse. Can you try Eclipse 3.4.1?

It looks like you are using Eclipse 3.4.1, but do not have the EMF plugin. You should be able to get that from the "Ganymede Discovery Site".

Technically, I think the Eclipse 3.4 install mechanism is supposed to be smart enough to dynamically find it though