This wiki will help you walk through the process of successfully changing your server version. You don’t require any coding experience for this process. Let’s begin:

Step 1: Go to the Game Panel and open the file manager. 

Step 2: Rename your new Minecraft server file to "server.jar" and upload it on the file manager. WARNING!! Do NOT try to downgrade your current world, it will crash the server and might cause data corruption.  If you want to downgrade, you will have to reset the world.

Step 4: Restart the server!! Your server version is now changed.

Step 5: Review us at https://www.trustpilot.com/review/www.humbleservers.com  :D