I suspect the problem may be related to the 64-bit architecture. I am unable to install Abridged JBoss Tools 3.3 to Eclipse running on Windows 7 Professional 64-bit with only JBoss repositories enabled. I get the message:
An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://download.jboss.org/jbosstools/updates/JBossTools-3.3.0.Beta2.core/plugins/org.jboss.tools.common.projecttemplates_3.3.0.v20120302-0132-H47-Beta1.jar.
Read timed out
Unable to read repository at http://download.jboss.org/jbosstools/updates/JBossTools-3.3.0.Beta2.core/plugins/org.jboss.tools.forge.runtime_1.0.0.v20120328-1255-H60-Beta2.jar.
Read timed out
I have also had difficulty on another machine, likewise running Windows 7 Professional 64-bit. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=374584
I know of no other way to install the package.