We have seen reports of players encountering the error message “DirectX 12 is not supported on your system. Try running without the -dx12 or -d3d12 command line argument.” 

As a first step, please double check to ensure your system meets the minimum requirements to run Last Flag (see below) and has a dedicated GPU. If it does and you are still receiving this error, try updating your graphics drivers. This may resolve the issue if your drivers were out of date. Instructions to update graphics drivers can be found above. If the issue still persists, please let us know in our Discord bug report forum.