Fab plugin downloads are breaking with "invalid manifest" on MacOS. Working fine on my Windows laptop

[r0bray]

Summary

Fab plugin downloads are breaking with “invalid manifest” on MacOS. Working fine on my Windows laptop

What type of bug are you experiencing?

Plugins

Steps to Reproduce

Install the new Fab plugin in UE 5.4 on a Mac.
Add this asset pack to my library. https://fab.com/s/ab1a673f30f5
Invalid Manifest error on my Mac. Downloads fine on my PC.

Expected Result

I should not get an error in my log. It should work on both platforms.

Observed Result

LogFab: Display: Asset Type = unreal-engine
LogFab: Display: Is Quixel = 0
LogFab: Display: Base Url https://epicgames-download1.akamaized.net/Builds/Rocket/Automated/VehicleP15e5452c412cV1/CloudDir,https://download.epicgames.com/Builds/Rocket/Automated/VehicleP15e5452c412cV1/CloudDir,https://fastly-download.epicgames.com/Builds/Rocket/Automated/VehicleP15e5452c412cV1/CloudDir,https://cloudflare.epicgamescdn.com/Builds/Rocket/Automated/VehicleP15e5452c412cV1/CloudDir
LogFab: Error: Invalid Manifest

Platform

UE 5.4.4 on MacOS Sonoma

Operating System

MacOS Sonoma

[l4k4i]

I have the same problem on windows trying to download a grocery store asset i bought a while ago.
LogFab: Display: Base Url https://cloudflare.epicgamescdn.com/Builds/Rocket/Automated/Grocerys0c43c249732dV1/CloudDir,https://epicgames-download1.akamaized.net/Builds/Rocket/Automated/Grocerys0c43c249732dV1/CloudDir,https://download.epicgames.com/Builds/Rocket/Automated/Grocerys0c43c249732dV1/CloudDir,https://fastly-download.epicgames.com/Builds/Rocket/Automated/Grocerys0c43c249732dV1/CloudDir
LogFab: Error: Invalid Manifest

[TimothyBrake]

Same here… Tried 2 packs but none are added to the project with onky an error in the output log
LogFab: Error: Invalid Manifest

Others work well so I guess it has something to do with the content creators need to create a proper manifest file on their part for all assets

[Seto]

The same here.
Official examples are not able to download. ML Deformer Samples, Valley of the Ancient, Electric Dream Env.

[mangele]

hello everyone,
@BGTITAN-DENIS posted the solution here:

500×500 2.84 KB

Solution found. It might be all Mac users who can’t download any FAB Unreal Engine assets. Why? Because ALL of the UE assets download manifest on FAB only list platform of [“Windows”]. Epic Game launcher requests mac as platform that leads to a 404. SOLUTION: Create scripting overwrite using a tool like Proxyman. Here’s what I had to do to fix this, simply overwrite the initial manifest request platform to mac, now magically everything works. my setup: [image]