If you share why you want the mod menu (unlocking doors, flying, exploring cut content), I may be able to point you toward a safer method — like using Cheat Engine yourself on a backup copy of Alpha 4, or finding a video that explains the process without distributing suspicious files.
I notice you're asking about a for Hello Neighbor Alpha 4 .
Hello Neighbor Alpha 4 UI Style: Collapsible ImGui Panel (Draggable, Transparent Background)
Jump directly to specific mini-games or spawn items like the red key or cooled crowbar instantly.
If you're looking for a mod menu specifically for (the pre-release version from 2016–2017), here's what you should know: