On March 31st, 2017 at 10 PM, Perfect World Entertainment removed access to the following games through Steam:
To better support our current user base for these four games, we have decided to remove access through Steam which will allow us to streamline our release process in a more efficient manner by only focusing on our Arc portal. Removing steam access will also affect the ability to purchase in-game currency using Steam Wallet funds.
All player data for each of the games will still be available. Please go to http://www.arcgames.com, download the Arc client, and proceed to download the the game that you want to continue playing. Access to your game data will require you to login with the Arc account that you originally created when you first started playing one of these games through Steam.
We apologize for any inconvenience this may have caused and we thank you for your continued support!