An error occurred during the org.eclipse.equinox.internal.p2.engine.phases.CheckTrust phase.
session context was:(profile=SDKProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.CheckTrust, operand=, action=).
Error reading signed content.
/Users/phil/eclipse 4.4/plugins/javaewah_0.7.9.v201401101600.jar (No such file or directory)
Eclipse 4.4 M7 comes with EGit 188.8.131.52405051725-m7 which is the EGit milestone build for Luna M7.
http://download.eclipse.org/egit/updates always has the latest release which is 184.108.40.206404171909-r
at the moment. So currently it doesn't make much sense to try upgrading 4.4 M7 from this update site.