Is AppSumo the site so nice, you signed up twice? We understand. We all have more than one email address, so we get it if you signed up for more than one AppSumo account.
Our apologies for any inconvenience, but unfortunately, our system doesn't support the merging of accounts at this time.
We recommend you save any product information (codes, instructions, expirations, etc.) from the account you no longer want to access on an external hard drive or in the Cloud and then shoot us an email about deactivating that account. That will prevent you from logging into the wrong account in the future and will keep all of your AppSumo info in one place.
Heads up: Once an account is deactivated, the email address associated with that account cannot be used for another AppSumo account (this includes creating an account or adding an email address to an existing account).