Itemsadder Portable -

Players joining the new IP will automatically download the pack from the new server's address.

/Minecraft-Portable-Server/ ├── start.bat (or start.sh) ├── server.properties ├── plugins/ │ ├── ItemsAdder.jar │ ├── ProtocolLib.jar (Required for IA) │ └── ...other plugins ├── worlds/ └── config/ └── itemsadder/ ├── config.yml ├── language_messages.yml └── contents/ ├── my_custom_sword.yml ├── my_custom_armor.yml └── packs/ └── my_resource_pack.zip itemsadder portable

It sounds like you are looking into , which is the most popular custom items plugin for Minecraft (Java Edition). Players joining the new IP will automatically download