Hello,
Thanks for purchasing our pack!
We are having a similar issue; our older packs are failing to download as well. We don’t think the issue is on our side, and the issues should be resolved by the Fab team in a few hours.
In the meantime, you can try to delete the Vault Cache to force the launcher to re-download the packages.
Vault Cache can be located via the launcher Downloads/Download Settings and by default it should be C:/ProgramData/Epic/EpicGamesLauncher/VaultCache
If you are still having trouble after some time (give it a day):
Please open a ticket with Fab, they have an excellent support team https://support.fab.com/ and mail us at support@themightycat.com.
We will be glad to help you out with this case and make sure it gets resolved.
All the best,
Stay Mighty