How do i download the server edition 19.9
Start from here friend: Server Edition | Manager
Only the current version is available for download
The version number is shown here https://www.manager.io/download/
The link posted by @Abeiku will also lead to start trial page which will also download the current software version.
Btw @Aci_Sabuj you are off the topic of this thread, please search the forum then add to an existing topic or start a new topic if you have a new problem.