In this tutorial, we are going to explain how you can upgrade a 1.15.x server to 1.15.

Comments:

• Make a backup of your server before starting!
• This does not work for versions under 1.14
• Also, make sure that your plugins are available for 1.15 and also upgrade them afterwards.
• Depending on your world size, this can take a long time. This script converts all the chunks of your world 1 for 1. With a world of a few GB in size, this can take up to tens of minutes.

Upgrade steps

1.  Stop the server.
2.  Download a 1.15 spigot version from Getbukkit.
3. Upload the jar to the server and rename it to server.jar or to the defined name in Configuration > Startup Parameters > Server Jar File
4. Go to Configuration > Startup Parameters and add --forceUpgrade to the Startup Command. (Note that only the support team can do this)
5. Start the server.
6. Wait for the upgrade to finish.
7. Remove --forceUpgrade from Configuration > Startup Parameters > Startup Command. (Note that only the support team can do this)