While the linking can be done only via the downloaded game on the respective platform, the unlinking function does not require entering the game. You can unlink any linked platforms via the Deep Silver Account website. Here's a detailed guide on how to do that. 

• Start by signing in to your Deep Silver Account.
• Go to Account > Games.
• Press on the tab of the game you want to unlink from the platform.
• On the right side of the game page, there will be a sidebar depicting all linked platforms and a brief game description.
• In the bottom right corner of this panel, there will be a broken chain icon (this is the unlinking feature):

• Press this button, then choose the platform you want to unlink:

• Please note that the Deep Silver Account will delete all your data for this platform, and you will lose your rewards on the Deep Silver Account related to this platform.
• Once the button is pressed, the platform will be unlinked. Note that it may take up to several minutes for changes to appear.

If you are facing any issues, kindly contact our support team directly by clicking on the "Contact Support" button.