# UEFN remote validation fails because Build.bat and UnrealBuildTool are missing after reinstall 

**URL:** <https://forums.unrealengine.com/t/uefn-remote-validation-fails-because-build-bat-and-unrealbuildtool-are-missing-after-reinstall/2720960>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fortnite\
**Created:** [May 9, 2026, 4:57am UTC](https://forums.unrealengine.com/t/uefn-remote-validation-fails-because-build-bat-and-unrealbuildtool-are-missing-after-reinstall/2720960 "2026-05-09T04:57:29Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [May 9, 2026, 7:18pm UTC](https://forums.unrealengine.com/t/uefn-remote-validation-fails-because-build-bat-and-unrealbuildtool-are-missing-after-reinstall/2720960/2 "2026-05-09T19:18:50Z")

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> [@MustangWolf77](#):
>
> At least 1 module failed remote validation".

This error has was fixed in 40.00 by a new function to use

 ![ClearRemoteSource](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/4/4/b4407a6f12c1675ca196cd0038f33379ec502ddd.png)

Then Verify

[How to verify UEFN and Fortnite installation](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

Build.bat comes from UE5 standard Engine an the best idea is to remove all UE 5.\* SE before installing UEFN

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_[View the full topic](https://forums.unrealengine.com/t/uefn-remote-validation-fails-because-build-bat-and-unrealbuildtool-are-missing-after-reinstall/2720960)._