Terraria | How to Change your Server Version Terraria Vanilla
Terraria | How to Change your Server Version Terraria Vanilla
This process require the knowledge of using SFTP. Learn How to Manage Files using SFTP
Download the Version you want on this link Terraria Version Download
Open your SFTP and login using the credentials on your panel
On the right side, delete the folder called "saves"
On the left side, Locate the Terraria Version you downloaded
Example: terraria-server-1405
Open the folder called "Linux"
Upload all of the contents of Linux Folder to your Server Files (Right Side)
Click Yes to Overwrite All when it appears.
After you're done transferring. You can now start your server.
NOTE on Terraria Server Version 1.4.0.5
Once you start the server, it will give you an error like this

SOLUTION
Go to your Files and Locate the saves > Worlds
You can see that the server failed to generate the world
This is a known bug for 1.4.0.5
Upload an already Generated World to the Worlds Folder
It is world.wld and world.wld.bak
Then Start the Server on Console
All done! You can now play on your desired Server Version!
Updated on: 21/05/2021
Thank you!