# Cannot Install Unreal Engine – Engine Versions (+) Button Greyed Out and Install Button Unresponsive 

**URL:** <https://forums.unrealengine.com/t/cannot-install-unreal-engine-engine-versions-button-greyed-out-and-install-button-unresponsive/2851099>\
**Category:** Issues and Bug Reporting (Unreal Engine)\
**Tags:** unreal-engine, question\
**Created:** [November 5, 2026, 6:39pm UTC](https://forums.unrealengine.com/t/cannot-install-unreal-engine-engine-versions-button-greyed-out-and-install-button-unresponsive/2851099 "2026-11-05T18:39:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mofy-x](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mofy-x](https://forums.unrealengine.com/u/mofy-x)\
**Post date:** [November 5, 2026, 6:39pm UTC](https://forums.unrealengine.com/t/cannot-install-unreal-engine-engine-versions-button-greyed-out-and-install-button-unresponsive/2851099/1 "2026-11-05T18:39:14Z")

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### Summary

I cannot install Unreal Engine through the Epic Games Launcher. The Engine Versions (+) button is greyed out, and the Install Engine button does nothing when clicked.

### What Type of Bug are you experiencing?

Other

### Steps to Reproduce

1. Open the Epic Games Launcher on Windows 11.
2. Navigate to Unreal Engine \> Library.
3. Try clicking the + button under Engine Versions.
4. Try clicking the yellow Install Engine button.
5. Observe that no installation starts.

### Expected Result

The Engine Versions (+) button should allow me to add an engine version, and the Install Engine button should start the Unreal Engine installation process.

### Observed Result

The + button remains greyed out. Clicking Install Engine briefly changes the button appearance, but nothing happens. No engine version can be installed.

### Affects Versions

5.8

### Platform(s)

Windows

### Upload an image

 ![スクリーンショット 2026-11-05 131117.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/7/a/17a5deb3f74ad0094e9a3acd3265395177749b48.png)

### Additional Notes

Troubleshooting already attempted:

- Restarted the launcher and Windows.
- Ran the launcher as administrator.
- Deleted the launcher webcache.
- Repaired, uninstalled, and reinstalled the launcher.
- Tried a different Epic Games account.
- Switched between Games Library and Unreal Engine Library.
- Tried creating a project from the Game Animation Sample.

None of these steps resolved the issue.

System: Windows 11, NVIDIA GeForce RTX 4070 SUPER, 32 GB RAM.

I have never successfully installed Unreal Engine on this computer. I also encountered a missing MSI installer file error during a repair attempt through Windows Control Panel, but reinstalling the launcher did not fix the issue.

A similar report:

> [@Epic Games Launcher shows no Engine Versions and fails to install Unreal Engine](https://forums.unrealengine.com/t/epic-games-launcher-shows-no-engine-versions-and-fails-to-install-unreal-engine/2845382):
>
> Summary I created a new Epic Games account today and installed the Epic Games Launcher on Windows. The Engine Versions section in Unreal Engine \> Library is empty, and clicking the + button does nothing. Clicking Install Engine results in “Product Activation Failed! Error Code: E150-1041”. The Unreal Engine EULA does not appear in the Launcher or on the Unreal Engine website. The launcher log contains “Loaded 0 item files” and “found 0 entitled apps”. I have restarted the Launcher, run it as adm…