The most time consuming part of switching from a low fender to a high fender is tracking down all the parts that you need. I did this on my KTM 640 Adventure, however the concept and many of the parts can be used for different Adventure Bikes (Tyson has a 990 and it was a similar process).
Parts list
KTM Front Fender 690 Enduro (Orange): 7650801000004
KTM Fork Protector Set 85 SX (Black): 4700109400030
Brake Hose Guide: 59008019000
-you will need to buy one and use the stock one that is already installed on your moto
Front Brake Hose Guide: 60013025100
Rubber for Brake Hose Guide: 60013025050
Front Brake Line—Galfer Stainless Steel Front Brake Line Kit: 251241147275
-you can get whatever front brake line you prefer. This one that I ordered from ebay came with a new banjo bolt (which you actually don’t necessarily need as you can just reuse the ones you have) and new crush washers. You will want to make sure you have enough copper crush washers to replace all of the ones that come off of your bike (CU-Seal Ring DIN7603-10x16x1: 42013226000 x7)
HH Collar Screw M6x20, WS8: 0014060203 x4
– these will bolt your fender to your triple clamp
HH Collar Screw M6x15 TX30: 0024060156 x7
– these will bolt your fork guards and your bracket to the forks and your new brake line guide in place
Spacer Bushing: 50208020000 x4
– these bushings will go in the holes in the fender to protect the plastic
Misc. parts to have on hand or get from your local hardware store:
Nylon Spacers: x 4 stand by on size or just take your bolts to the hardware store and get some that fit the right bolt. They are cheap.
Washers: x8 (you will use four washers for the bolts that bolt up the fender and brake guides to the triple clamp. I also used 2 washers per side on my third fork guard bracket bolt, so as to not bend the shit out of my aluminum bracket, you may have to play around with it and adjust)
Rivets and rivet gun (if you decide to rivet your fork guard to your bracket)
Blue Thread Locker
Brake Fluid (whatever your bike calls for) and Brake Bleeding device or method
1/16 x 3/4 inch flat stock aluminum: approx. 8 inches
I’m sure I’m forgetting something and will update this if I am. Also, I have a set of metric KTM bolts which is extremely nice to have for projects like this. You may be able to reuse some bolts that came out of your bike too, so you may have to adjust your parts list accordingly.