got it working after some troubleshooting, for the ones that want to know how you need to do this:
place the junction of all folders INSIDE of your content folder, so
you have: C:/Users/[Username]/Documents/Unreal Projects/[Projectname]/Content/[the Junction links: InfinityBlade, Starter content etc.]
the program needed to create such a link is Link Shell Extension.
takes a bit of time to get set up but will save you HEAPS of storage space…
and use all content folders as target source: select all content in file explorer, [RMB] and pick link source. now go to your new project and drop as… Junction. ignore the errors given and delete the junctions from the folders which were there already.
good luck linking 