The Mod Kit is much more demanding than the actual game. If your system doesn't meet the requirements, the editor may never finish loading. [Solved] Unreal Editor loading stuck at 45% - C++

Happy modding, and may your loading bar reach 100%!

The most common cause for a freeze at 45% is the initial compilation of shaders. The Unreal Engine 4, which the Mod Kit is built on, is compiling visual effects for your specific hardware. The time this takes depends entirely on your processor, ranging from a few minutes on a high-end machine to an hour or more on a lower-spec one. If this is your first time launching, let it sit for at least 30-60 minutes before assuming it's frozen.

This forces the launcher to discard the corrupted partial file and redownload the specific chunk causing the blockage.

Delete the DerivedDataCache folder. This forces the engine to restart the compilation process cleanly. If you'd like to proceed, let me know: What are your (specifically your CPU and GPU)? How long has it been stuck at 45%? Is this your first time opening the Mod Kit? [PC] The game crashes at start – Hello Neighbor Support

: Make sure your game and the Mod Kit are up to date. Sometimes, updates can resolve known issues.

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: This is the most effective "fix." Depending on your CPU speed, the initial loading can take anywhere from 10 minutes to several hours . If you check your Task Manager ( Ctrl + Alt + Delete ), you should see several "ShaderCompileWorker" processes active, indicating the engine is still working.

The Hello Neighbor Mod Kit is built on Unreal Engine 4. Unlike standard game installations, the Mod Kit includes large binary files and engine prerequisites. The 45% mark usually coincides with the transition from downloading core assets to downloading engine-specific binaries or verifying the massive main asset file.