Cannot complete the install because one or more required items could not be found.
Software being installed: Subversion Revision Graph 1.0.9 (org.tigris.subversion.subclipse.graph.feature.feature.group 1.0.9)
Missing requirement: Subversion Revision Graph 1.0.9 (org.tigris.subversion.subclipse.graph.feature.feature.group 1.0.9) requires ‘org.eclipse.draw2d 3.2.0′ but it could not be found
If you happen to get this error while installing the Subclipse plugin on Aptana Studio 3, it means you need to install the Graphical Editing Framework Draw2d first, which is not included in the current Aptana Studio 3 package.
Draw2d is part of GEF, which you can get from http://download.eclipse.org/tools/gef/updates-pre-3_8/releases/. Draw2d is the first package when you expand the GEF from the menu. No need to install the other items unless you know that you need them for something else.