If the new patch didn't work for you I have a solution that will hopefully get you your missing DLC as it did for me. Now I have previously purchased the season pass. I first uninstalled the season pass, then I uninstalled the latest patch from the console. Then I reinstalled the season pass from outside the game. Last I restarted the game and re downloaded the latest patch. The popup menu for valley of the yetis popped right up and allowed me to download without charge. There is also now an option to download it from the news page of the game on the main screen at the bottom. Hope this helps.