Epic Launcher detects UE 5.4 but not my projects – Fab assets/plugins fail to install (fab-fab001)

Hi,
Epic Games Launcher correctly detects Unreal Engine 5.4, but it does not detect my existing projects on my D:, I moved my projects to D: from default which was documents on C: because my C: had started to get it’s storage full, which all prevents me from adding Fab / Marketplace assets directly to them.

Current setup:

  • Epic Games Launcher installed in:
    D:\Epic Games\Launcher

  • Unreal Engine 5.4 installed in:
    D:\Epic Games\UE_5.4

  • Projects located in:
    D:\UE_Projects\MyProject

  • Vault Cache located on D: (not C:)

  • Windows system drive (C:) is nearly full, so I avoid using Documents

Issue:

  • In Epic Launcher → Unreal Engine → Library:

    • My Projects shows “No user projects found”
  • Marketplace / Fab:

    • “Select the Project to Add the Asset to” shows No compatible user projects found

    • Installing Fab assets (e.g. Beech Rose) fails

    • Plugin installation fails with errors fab-fab001 / fab-fab0001

  • UE 5.4 itself launches and opens projects normally when I double-click the .uproject

What I’ve tried:

  • Opening the project in UE 5.4 (from .uproject)

  • Running Epic Games Launcher as Administrator

  • Restarting Windows

  • Disabling my Windows Firewalls

  • Clearing Epic Launcher webcache

  • Uninstalling UE and Epic Games again on my D

  • Deleting Epic manifest cache to force rescan

  • Setting Default Install Directory to D:\Epic Games

Question:
How can I make Epic Games Launcher properly register projects located on a custom drive (D:) so that Marketplace / Fab assets can be added to them and required plugins install correctly?

Thanks.

I can’t really help you fix the Epic Game Launcher, since I never use it – you can use AssetManagerStudio as a replacement and should be good to go, it allows you to configure multiple project, assets, and engines directories (i.e. you can have them in multiple places on C, D, E, F … Z… ) without any issues.

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