Where can I download Trados Studio SDK 2019? (Not Trados templates)

Hi guys!

Where can I download Trados Studio SDK 2019? (Not Trados templates) I have a freelance license (2019) and checked the local files in the SDK folder but there are no SDK files. I wanna learn how to create Trados plugins, so I need SDK. (I am a newbie developer :D That's why I came here.) I also looked for SDK on the internet but could not find any links to download it.

Please help. Thank you! :)