Hi all,
you can now activate the performance edition of the demo via the steam beta branch. As a result of some error-reports (such as not running the game at all) it is optimized for "older" hardware.
It does not need a SM6 compatible graphics card and has some other optimizations for lights, shadows, physics and reduced overall geometry with performance in mind. It also features a different color-scheme for the submarine so you always know, what version you play.
If you want to play multiplayer, make sure everyone has the same version installed.
Thank you and greetings, Dev