Log in to the Kinetic Panel.
Stop the server.
Navgaite to the World Installer.
Search for the desired world you can search via
Categories
Versions
Search Bar
Once you have found a World, select the version from the drop-down.
Click download.
Kinetic Panel guide
How to use the World Installer
The world installer lets you easily install custom worlds. Giving you access to a wide range of Minecraft worlds.