To fix your problem you only need to update the 'Grails Support' tools.
When you do that, the installer will figure out dependencies.
It looks like you can't upgrade because of this
'bundle org.eclipse.mylyn.tasks.ui [3.7.0,4.0.0)' but it could not be found.
Mylin is softwarethat comes from Eclipse (i.e. it isn't part of STS itself, but it normally comes bundled when you download
the full STS package, which contains Eclipse inside). Normally the installer should be able to find it in one of the update sites that are automatically configured with STS. But there has been recent version changes in mylin so that could be the reason for the problem.
Let me figure out what update site you could add to satisfy this dependency.
I'll get back to you shortly.
Kris De Volder -- SpringSource