This Vulkan API error means the game cannot detect your primary graphics card. Ensure your monitor is plugged directly into your GPU, not your motherboard, and disable any integrated CPU graphics in your Windows Device Manager. Frequently Asked Questions Is Update 6.66 the final version of DOOM Eternal?
The initial (released October 26, 2021) was already a massive free upgrade. It introduced: download upd doom eternal deluxe edition v666 rev