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

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