ViaVersion / ViaBackwards / ViaRewind
What does the plugin do?
These plugins allow Java users to connect to your server from versions below and above what your server is currently running.
ViaVersion needs to be installed for ViaBackwards and ViaRewind to work and ViaRewind needs ViaVersion and ViaBackwards to work.
Download the plugins and upload them into your
plugins folder. Restart or turn on your server. If you need help with installing plugins, check out this guide.
Once you have installed the plugins and restarted your server, Java players should be able to join from any version!