There are two patches available for download on the official page:
In the base game, there is no option or toggle for walking, as opposed to running in the over the shoulder camera view. A small mod addressing this is available here. The download also contains installation instructions.
Ambient Occlusion compatibility
0x0000002D (MechWarrior Online)
Ambient Occlusion usage
Ambient Occlusion setting
In some cases (when the intro cinematic is skipped or if opening the Steam overlay) the mouse cursor does not function on the main menu. This can be fixed by holding the key that releases the mouse in Over the Shoulder view(Shift by default).
Use a program such as Borderless Gaming to force the game to run in a borderless window.