Leave the Mod Kit open and do not click on the window (which might prompt Windows to say the program is "Not Responding").

If you have waited for several hours and the progress has not moved, try these alternative troubleshooting steps: How to fix Unreal Engine 4.18.1 stuck at Initializing 45%

: This process can take a very long time (sometimes over an hour) depending on your CPU speed. Check Task Manager Ctrl + Shift + Esc . If you see ShaderCompileWorker

The time it takes to move past 45% depends entirely on your PC's hardware: May take 5–10 minutes . Mid-Range PCs: Can take 30–60 minutes .

: If you do not have a dedicated GPU, the editor may fail to launch entirely or perform so poorly that it effectively stays frozen. Unreal Engine

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