Hi @r3sonant ,
This WONT GO with Windows 7/8 some one else tried it!
Uninstall the current Epic Launcher, reboot you Windows 10/11 and re-install the Epic Launcher by Google “Unreal Engine Epic Launcher” and install
When you log in to Launcher you MUST use email address and password logon.
NOT the new things like Facebook, Google association social media connection like Discus 
useless, they WONT work.
see post I can’t log into Quixel Bridge - General / Feedback for Unreal Engine team - Unreal Engine Forums
I created my account long before those logins existed.
You must fill in you home address and UK Postcode and save the details and tick the box I accept the terms and conditions
You will need to look at your account
Obviously I have the previous Connections from Unreal 4 and the External Quixel Bridge, but these are needed and I don’t know how you get these .
I have NEVER had Quixel Bridge in my Vault only Marketplace PURCHASES.
To check your account Connections.
Connections (unrealengine.com)
Epic Games Account Support | Get Account Help & Customer Service
How do I upgrade a console or platform account to a full Epic Games account? - Epic Accounts Support
I can see lots of Quixel Bridge Marketplace
Content by Quixel+Megascans - UE Marketplace (epicgames.com)
In Epic Launcher try Unreal Engine → Settings → Troubleshooting and check everything is green.