Linking the game to PROS grants you access to a unique item in the game, which is Marshall Rocket Launcher. To acquire this item, you need to progress in the game till you unlock your apartment and the weapon cache. Here's a detailed guide on what to do after this.

Obtaining the Launcher

• Ensure that you have already linked your game to the PROS account.
• Once you've linked your game to the PROS system, the Launcher will be waiting for you in your apartment's weapon cache.
• Locate your apartment and enter it.
• Inside the apartment, find the weapon cache (the location will be shown on the map with the respective icon):

• Interact with the weapon cache, then acquire the Launcher via the weapon cache menu. This way, you will obtain the Marshall Rocket Launcher.