Open the Shattered Codex Download Hub and copy the manifest for the premium module you want to install.

Premium modules require an active Patreon subscription. If your Patreon access is not active, the manifest download will not be authorized.

Use the Copy action to copy the manifest URL for the module.

This is the URL you will paste into Foundry's Install Module dialog.

If updates ever stop downloading, open the Download Hub again and sign in again. That revalidates your token, and the manifest will start authorizing downloads normally again.

In Foundry, open Add-on Modules and click Install Module.

Paste the manifest URL into the manifest field and confirm the installation.

After the install finishes, enable the module in your world as usual.