Hello Tecnico Tefralux,
Thank you for posting in Microsoft Community forum.
First, you need to install the Remote Desktop Licensing role and activate the license server. For more information, please refer to the following documentation:
Activate the Remote Desktop Services license server | Microsoft Learn
After activation, you will need to install the RDS Client Access License on the Remote Desktop License Server, you can refer to the provided documentation for the specific steps:
Install RDS client access licenses | Microsoft Learn
The first screenshot you provide is not exactly the same as the normal installation process, please provide the corresponding path. I observed that your picture looks a lot like activating a server license, please note that there is a difference between the installation of the RDS license and the activation of the server license. You can refer to the steps I provided to do it.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan