After installing the plugin as normal, you must set the resource pack.

You can do this by setting the "server-resource-pack" property in server.properties to "https://alignedcookie88.com/files/.packs/HeartboundSMP_Pack_1.1.0.zip".

As per the license, you must use the above URL if possible.

The plugin will automatically install its datapack into the world files. Please note that this datapack is still bound by the license and you must remove it before distributing world files elsewhere.