Installation Problem: Eclipse HELIOS and the latest GWT Eclipse

Hi,
I had used GWT back in the 1.4 days, and recently had a project that
I thought I could use it again. I have had some difficulty
installing, however. As suggested here:

http://code.google.com/webtoolkit/usingeclipse.html#eclipse

I downloaded eclipse-java-helios-SR2-macosx-cocoa-x86_64.tar.gz for my
Mac running OSX 10.7, extracted it, ran it, and added the plugin via
"Install new Software" with the URL: http://dl.google.com/eclipse/plugin/3.6

When I go to add the plug-in, I get this error:

An error occurred while collecting items to be installed
session context was:(profile=epp.package.java,
phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=,
action=).
No repository found containing:
osgi.bundle,org.eclipse.jst.common.project.facet.core,
1.4.102.v201008182136
No repository found containing: osgi.bundle,org.eclipse.wst.css.core,
1.1.402.v201102031915
No repository found containing: osgi.bundle,org.eclipse.wst.css.ui,
1.0.502.v201101122002
No repository found containing: osgi.bundle,org.eclipse.wst.html.core,
1.1.404.v201101190004
No repository found containing: osgi.bundle,org.eclipse.wst.jsdt.core,
1.1.4.v201102102045
No repository found containing: osgi.bundle,org.eclipse.wst.jsdt.ui,
1.1.4.v201102160540

I don't know how to proceed. This is a fresh Eclipse and a fresh
GWT. Any suggestions? Thanks for any help you can provide.

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