just recently, I tried to install, but I ran into the same problem. And I always installed it through itch. io.
NullReferenceException: Object reference not set to an instance of an object.
UnityEngine.InputSystem.InputManager.FireStateChangeNotifications (System.Int32 deviceIndex, System.Double internalTime, UnityEngine.InputSystem.LowLevel.InputEvent* eventPtr) (at <00000000000000000000000000000000>:0)
UnityEngine.InputSystem.InputManager.FireStateChangeNotifications () (at <00000000000000000000000000000000>:0)
UnityEngine.InputSystem.Utilities.DelegateHelpers.InvokeCallbacksSafe (UnityEngine.InputSystem.Utilities.CallbackArray`1[System.Action]& callbacks, Unity.Profiling.ProfilerMarker marker, System.String callbackName, System.Object context) (at <00000000000000000000000000000000>:0)
UnityEngine.InputSystem.InputManager.OnBeforeUpdate (UnityEngine.InputSystem.LowLevel.InputUpdateType updateType) (at <00000000000000000000000000000000>:0)
Cores.InputCore.Tick (System.Single delta) (at <00000000000000000000000000000000>:0)
Core.Controller.Tick (System.Single delta) (at <00000000000000000000000000000000>:0)
UpdateCore.Tick (System.Single delta) (at <00000000000000000000000000000000>:0)
UnityEngine.InputSystem.InputManager:OnBeforeUpdate(InputUpdateType)
Cores.InputCore:Tick(Single)
Core.Controller:Tick(Single)
UpdateCore:Tick(Single)
or
NullReferenceException while executing 'InputSystem.onBeforeUpdate' callbacks
#0 0x71eb8b446c (libunity.so) ? 0x0
#1 0x71ebf47560 (libunity.so) ? 0x0
#2 0x71eb561998 (libunity.so) ? 0x0
#3 0x71eb5618a8 (libuni
ty.so) ? 0x0
#4 0x71ea17d8a8 (libil2cpp.so) ? 0x0
#5 0x71e9d0d3c0 (libil2cpp.so) ? 0x0
#6 0x71e9d8292c (libil2cpp.so) ? 0x0
#7 0x71e6445fd8 (libil2cpp.so) ? 0x0
#8 0x71e6445f24 (libil2cpp.so) ? 0x0
#9 0x71eb7f2838 (libunity.so) ? 0x0
#10 0x71eb8068f4 (libunity.so) ? 0x0
#11 0x71eb8c3528 (libunity.so) ? 0x0
#12 0x71eb949a14 (libunity.so) ? 0x0
#13 0x71e65cf228 (libil2cpp.so) ? 0x0
#14 0x71e65e5e10 (libil2cpp.so) ? 0x0
#15 0x71e64e62fc (libil2cpp.so) ? 0x0
#16 0x71e6445fd8 (libil2cpp.so) ? 0x0
#17 0x71e6445f24 (libil2cpp.so) ? 0x0
#18 0x71eb7f2838 (libunity.so) ? 0x0
#19 0x71eb8068f4 (libunity.so) ? 0x0
#20 0x71eb81221c (libunity.so) ? 0x0
#21 0x71eb60a638 (libunity.so) ? 0x0
#22 0x71eb6df020 (libunity.so) ? 0x0
#23 0x71eb6df060 (libunity.so) ? 0x0
#24 0x71eb6df304 (libunity.so) ? 0x0
#25 0x71eb89b604 (libunity.so) ? 0x0
#26 0x71eb89c588 (libunity.so) ? 0x0
#27 0x724664a95c (base.odex) ? 0x0