TJServer

How the packets can be obtained from more recent client?
Is there a software for this and if yes, which one and how to operate it.

I would really like to help!

Packets are different than data center files.
Assuming you really meant to say Packets, those can be obtained with Cheat Engine there is a tutorial on this forum that you will find if you search a bit (I dont have it bookmarked).
It revolves around using the referenced string "C_TELEPORT" which is referenced (again) inside a function and you get all packets by injected a dll whose source code has been shared on this forum.

If you meant data center many tools have been shared and reworked by many authors, I am not sure if 1 is up to date as of now.
 
I compiled the server and the tera-launcher, for anyone who is interested on these files :)

 
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