How to change my version?

Click on the versions button in the Quick Access Box.



Select the Jar in which you want to change.



After which you can select the version that you want to use of that Jar.



Click the Install button, and confirm you want to continue the install.



Click Yes and after a few second the process will be complete.

If you downgrade versions you will have to delete your world file.



Changing your server jar may cause issues with your worlds, plugins and / or mods!