CD key Help "hate steam" -_-

Hello,
I've recently bought a CD key for Arma 2 and used Darky Key Changer to change my key. All this is done so I can play on a certain Dayz server I'm banned from. And as every new CD Key comes with reinstalling the Arma 2 update on Dayz Commander, but everytime I try it says "Wrong CD Key". Meaning I need to start the game up before I can actually reinstall the update. But seeing how I have the game installed on Steam it seems I absolutley have to start Arma 2 through steam. But everytime I do that steam automatically resets my CD key back to the original before I used the Darky Key Changer. So my question is how can I start Arma 2 OA without steam? Or is there a way I can update Arma 2 on Dayz Commander without starting steam up?

use dayz commander and tick off "launch through steam".