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No. For donate mods you only need to donate once to unlock multiplayer mode.
If you don't have a ModPack, fill in this field with the URL of the mod you donated to:
Example: OdinShipPlus
https://valheim.thunderstore.io/package/Marlthon/OdinShipPlus
The important thing is that during your registration and the first start of your server the IP is the same, after the start of the server a Key is generated on your server and after that there is no problem if your IP changes.