Unfortunately, The Expanse game didn't launch on Steam and we have no news at this time if that will be the case in the future, however, despite a C++ error via direct install of the Epic Games Launcher, there is a fix and we have the full guide here for you along with some gameplay and the best settings
You will need the Heroic games launcher and proton tricks for this one, then install the VCRUN2022 DLL via proton tricks in the Heroic Games launcher, it sounds a lot more complicated than it actually is and we cover it all in the video above.