Eclipse issue with Egit and Mylyn

I'm installing the latest XMOS Development Environment (XDE) which is Eclipse based. 

When adding Egit, I hit an issue with Mylyn.

Here's the detailed error message:

Cannot complete the install because one or more required items could not be found.
  Software being installed: EGit Mylyn (Incubation) 0.11.3 (org.eclipse.egit.mylyn.feature.group 0.11.3)
  Missing requirement: EGit Mylyn (Incubation) 0.11.3 (org.eclipse.egit.mylyn.feature.group 0.11.3) requires 'org.eclipse.mylyn.context.core [3.0.0,4.0.0)' but it could not be found

Removing Mylyn from the list of items to be installed seems to let me finish.

There is a usability issue with the plugin installer, at the point that licenses must be agreed to. It is not clear whether one must scroll through the copious licence pages in order to light up the >Next button. In fact, just selecting the blanket Accept radio button and clicking Finish is enough.