This offer is discontinued and only available for existing AppSumo Exclusive clients for upgrade and management purposes
For SumoLings, each AppSumo codes works as a discount of $99. Redeem your first code using this page. For stacking/upgrade please login to your account, go to Licenses then Upgrade Options. And upgrade to the next Plan using an other of your AppSumo code. Repeat the upgrade process for as many codes as you have.