http://blog.humblebundle.com/post/107906804069/changes-in-steam-key-redemption
A little over a year ago, we launched OAuth Steam key redemption, creating
one-click Steam key redemption for games purchased through Humble Bundle.
However, Steam is removing support for OAuth, so we’ll be returning to the
system we used before, which requires you to manually redeem your Steam keys.
Starting today, go to your Steam desktop client and use the "Activate a
Product on Steam" feature to redeem your keys.
For more details on how this process works, please check out our support page!
一年多前，Humble Bundle使用了OAuth，一種在Steam領取遊戲的認證方式，
只要一鍵就能將從Humble Bundle網站上買的遊戲領取到Steam。
然而，隨著Steam即將移除OAuth的支援，我們將回歸原先使用的系統，
也就是你必須手動將序號輸入到Steam上。
從今天開始在Humble Bundle買的遊戲，
就必須在Steam主程式的左下角 "+ 新增遊戲…" 輸入序號來新增。