I don't think you can anymore. However, you can install it through Arc and then just launch it using the exe file. That way you can launch and play without ever really needing to open Arc.
Using arc or steam to install it really isn't so bad because, as mentioned, all Cryptic games are thankfully set up in such a way that you can start them without ever using arc (or steam, although steam is far less bloaty)
(Hopefully) Useful CO Resources: HeroCreator (character planner), Cosmic Timers/Alert Checklist, Blood Moon Map, Anniversary Cat Map, and more (eventually, anyway).
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Click here to check out my costumes/milleniumguardian (MG) in-game/We need more tights, stances and moods