Post your script and we will see what it does / what needs to be changed for your use case.
Remove any passwords in case you got autologin within the script.
Tell us the paths and how many clients you want to start, what your monitor setup is like.

This is my personal script I used for WOW previously it has the following features:

- autologin, resize and position
- start separate clients based on my needs or start all via shortcuts (CTRL ALT KEY)
- shoprtcuts automatically re-arange windows to certain positions for switching main window
- activate mouse on all clients via numlock
- up down left right get sent to all clients always
- certain keys get sent to specific clients
- Shift S is always sent to all clients (to break follow)

It would need some editing for your needs. It's more advanced than the basic script that is shared for starters, but also not crazy advanced like some other highly specialized scripts. I shared it with multiple friends and they were able to adapt it real quick.
Your game probably won't need the WW1 WOW1 renaming scheme, that's specific to how wow starts a hidden process in the background this might be your issue if you used the basic script shared on the homepage.