How to: Fix Unreal Engine 4 Won’t Launch on Windows & Mac

How to: Fix Unreal Engine 4 Won’t Launch on Windows & Mac

Here we can see, “How to: Fix Unreal Engine 4 Won’t Launch on Windows & Mac”

  • According to several developers, Unreal Engine 4 is not compatible with Windows or Mac.
  • If Unreal Engine 4 won’t start, try running it with administrative privileges.
  • Check your third-party antivirus product and disable, if necessary, or remove it entirely.
  • If the problem was created by a Windows update, use the rollback option by following the instructions below.

For a lot of developers, Unreal Engine is crucial. Unreal Editor and its current version, UE 4, are must-have software in the development industry because they are free.

It runs smoothly on the most recent version of Windows 10, although some users are reporting problems. They were unable to open Unreal Engine 4 because of this.

Please take a look at the remedies we’ve provided for this problem below.

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What should you do if Unreal Engine 4 refuses to run on Windows or Mac?

1. Run UE 4 as an administrator

  1. Select the Unreal Engine tab in the Epic Launcher client.
  2. Expand the drop-down option under Unreal Engine 4 and create a desktop shortcut.
  3. Open Properties by right-clicking on the desktop shortcut.
  4. Select the Compatibility tab from the drop-down menu.
  5. Confirm changes by checking the Run this software as an administrator box.

Users were able to run Unreal Engine 4 without problems until it suddenly stopped working in most complaints identifying this issue.

This suggests that certain system modifications were implemented. There were a few adjustments that clearly disturbed the game installation.

The most prevalent cause is Windows Update (particularly big versions), which has broken Epic Launcher and Unreal Engine 4.

The first step we recommend is to try running the Unreal Engine client with administrator privileges.

2. Disable the antivirus

  1. In the Search box, disable antivirus Type Control and select Control Panel from the results list.
  2. Select Uninstall software from the Category view.
  3. Delete the antivirus software completely.
  4. Restart your computer and try again to run Unreal Engine 4.

A third-party antivirus could also be to blame for Unreal Engine 4’s failure. According to user reports, the ESET Internet Security solution is the recurrent perpetrator.

Many attempted to disable it, but the only lasting remedy was to completely uninstall the antivirus.

3. Double-check the installation

  1. Select the Unreal Engine tab in the Epic Launcher.
  2. Click Verify after expanding the drop-down menu.
  3. Wait until everything has been completed.

Before we proceed with the reinstallation, we should check the integrity of the Unreal Engine 4 installation files.

You can use Epic Launcher’s built-in utility to check for corruption in the installed files.

4. Uninstall the Unreal Engine client and reinstall it

For obvious reasons, if the installed files and files from connected apps become corrupted, the client will not start.

Is it possible that anything similar may happen following the large Windows 10 update? Possibly. As a result, you should complete the reinstallation process as well.

In addition, we recommend doing a clean uninstall, which includes deleting all Epic Launcher and Unreal Engine 4-related files (including registry entries).

We covered how to execute a clean uninstall; just remember to back up your projects.

5. Revert Windows 10 to a previous version

  1. Select Update & Security from the Settings app.
  2. Choose Recover.
  3. Under the Get started heading, click Get started. Revert to Windows 10’s earlier version.


I hope you found this guide useful. If you’ve got any questions or comments, don’t hesitate to use the shape below.

User Questions:

1. Why won’t Unreal Engine run on a Mac?

According to The Washington Post, without that access, Epic Games will be unable to produce future Unreal Engine versions for iOS and Mac devices. As a result, Unreal Engine software for iOS and Mac devices may become unusable.

2. Is Unreal Engine 4 compatible with Mac?

You may use Unreal Engine on a Mac to create iOS games, build iOS projects remotely, or learn game development by producing small games.

3. Is Unreal Engine owned by Epic Games?

Epic Games creates Unreal Engine, a commercially available gaming engine that also powers its in-house games like Fortnite and the Unreal, Gears of War, and Infinity Blade series.

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4. UE 4.25 doesn’t launch on iMac : r/unrealengine – Reddit

UE 4.25 doesn’t launch on iMac from unrealengine

5. Unreal Engine Version 4.25.4 won’t launch on Mac. – Reddit

Unreal Engine Version 4.25.4 won’t launch on Mac. from unrealengine