Hi thanks for the tip, unfortunately it did not work for me. I muted the game after the turn 10 intro, and play it on silent during the race. it seemed like it was fighting through the screen tears but it eventually happened again and the roads disappeared and then i ran into the invisible wall lol.
Really did not work for you? Im thinking if i did something else but No, just disabling sound helped me. That is strange.
Okay, I tried to mute the game right before the cutscene, then re-enable it during the cutscene (right before all of the trucks jump off the cliff) and it seems to work too. Looks like the issue is still somewhat during the transition from fall to winter.
Weirdly enough, I didn’t get any invisible road before the cutscene like I did before trying the trick for the first time…
FWIW, I deleted and reinstalled the demo and it now runs fine.
I’ve found a fix! When I launch my game I switch my sound to my monitor and not my headphones and boom it worked. Wait till ur ingame and driving around before you switch it back. I hope this can help the devs so they can make a fix
Sorry to hear that guys, i had hope that it will help for everyone. Also, i dont have any issues with dissapearing textures etc. i even set all my setting on Extreme setting and the game is running smooth @60fps. The only problem I HAD was the waterfall crash which No more exist because of that"trick" with sound i have found 
The update from a few days ago fixed my issue and the demo is flawlessly working on my end. Not sure if that’s the case for everyone though.
After messing with loads of things I finally got past the FH001 error code and then encountered sound problems.
After running the optimization test (with no sound) I got my results. Pretty good results
Then I quit the game and tried it again later na snow it’s just crashing after it goes full screen.