You will find your wallpaper and soundtrack at https://accounts.paradoxplaza.com/downloads and the in game items will appear after you've signed in to your Paradox account within the game itself.
Where can I find my sign up rewards?
You will find your wallpaper and soundtrack at https://accounts.paradoxplaza.com/downloads and the in game items will appear after you've signed in to your Paradox account within the game itself.