John Chapman has published a set of notes on the High Route on his website:
http://www.john.chapman.name/nz-dragon.htmlWe largely followed his notes when we did the Douglas Range Traverse a week ago, though we also borrowed from other sources. His notes are reasonably accurate, though there are a few places where I'd suggest changes! There is also a recent slip that makes one of the tricky sections more dangerous.
People have made comments that a GPS file would not be much use. I would disagree. And I'm not normally one to navigate much by GPS! The route (or at least one of the variants!) is mapped(?!) on OpenStreetMap and for those who are familiar with AndrewP's OSM maps for Garmin, you can find a similar NZ version here:
https://www.gpsfiledepot.com/maps/view/862/The main usefulness of the GPS data is that when you do lose the track - which will probably happen - you'll have a fair idea of how long ago and which direction you lost it. It certainly saved us some time on a few occasions.
It is also worth noting that the "High Route" is more a series of routes than a single route! There are at least two different ways through each of the three main clifflines to get to Anatoki Peak from Adelaide Tarn. This article touches on that:
https://www.wildernessmag.co.nz/bitten-dragons-teeth/