Lobby theme
Does this not apply anymore since it's a new season? I just spent 2 of those Digital gems to buy the lobby devious cybercat theme thinking it would upgrade to the chromocat version and be permanent, but it stayed as temporary chromocat and permanent cybercat that I just purchased.
Solution
It is not possible to purchase the permanent Device Chromacat Theme background anymore as the rewards in the Season Collections have been changed when new season comes.
