My parents live in the area (Graskop) and I’m bummed that I haven’t done the Fanie Botha either. You can perhaps have a look at “Avenza Maps” as well, it’s an app than has a database of contour maps available (most of the South African maps are available and free). I cannot guarantee that the maps are up to date but it can be a handy backup. The nice thing about the app is that it can show your location on the map so navigation is super easy.
Enjoy the hike, that part of the country is amazing.