Spring Source Tools Suite and grails support

This plugin for eclipse is supposed to provide groovy and grails support.
It seems if I install the IDE Core first all by itself, it will install, but this seems painful and perilous.

eclipse update fails

When trying to use the release update site:
SpringSource STS - http://www.springsource.com/update/e3.5
fails with


Cannot complete the install because one or more required items could not be found.
  Software being installed: SpringSource Tool Suite (required) 2.3.0.200912171331-RELEASE (com.springsource.sts.feature.group 2.3.0.200912171331-RELEASE)
  Missing requirement: SpringSource Tool Suite (required) 2.3.0.200912171331-RELEASE (com.springsource.sts.feature.group 2.3.0.200912171331-RELEASE) requires 'org.eclipse.mylyn.jira.ui [3.3.0,4.0.0)' but it could not be found


When tryhing to use themilestone update site
Springsource STS Milestone - http://www.springsource.com/milestone/e3.5


Cannot complete the install because one or more required items could not be found.
  Software being installed: SpringSource Tool Suite (required) 2.2.0.200910161543-RC2 (com.springsource.sts.feature.group 2.2.0.200910161543-RC2)
  Missing requirement: SpringSource Tool Suite (required) 2.2.0.200910161543-RC2 (com.springsource.sts.feature.group 2.2.0.200910161543-RC2) requires 'org.eclipse.mylyn.jira_feature.feature.group [3.3.0,3.4.0)' but it could not be found