It looks like it was temporarily removed due to some game-breaking bug. (Not sure what the bug is, though my best guess on the possible situation is that the game updated but it was corrupted or bugged in a way that they removed the download option so that they would have time to fix it.)
(看起来它由于一些破坏游戏的错误而被暂时删除。 （不确定错误是什么，尽管我对可能情况的最佳猜测是游戏已更新，但它已损坏或存在错误，他们删除了下载选项，以便他们有时间修复它。）)