# I can't launch UEFN aftre the update

**URL:** <https://forums.unrealengine.com/t/i-cant-launch-uefn-aftre-the-update/2715909>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, closed, fortnite\
**Created:** [April 16, 2026, 2:56pm UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-aftre-the-update/2715909 "2026-04-16T14:56:40Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**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:** [April 17, 2026, 9:29pm UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-aftre-the-update/2715909/8 "2026-04-17T21:29:13Z")

</div>

hi the update is a patch (partial).

However some of the files may have been isolated by a anti-virus program

[urc.exe and urc.dll get flagged as Malware from Microsoft Defender - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/2)

then [verify again](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

If that does not work this means clicking uninstall.

Then re install UEFN completely

---

_[View the full topic](https://forums.unrealengine.com/t/i-cant-launch-uefn-aftre-the-update/2715909)._