If you are unable to find your Spellbreak key, you can request the email be re-sent by visiting https://playspellbreak.com/resend-key. Keep in mind that this can only re-send your key once and will only send your regular Closed Beta key if you have one (not a pack key)!
If you cannot find either your freshly re-sent key email or your older email, the quickest way to find your 20-digit key for the Epic Games store is to do a search in your email Inbox, Spam, and Trash folders for the words "spellbreak" and "proletariat."
In the rare case that your email service provider automatically deletes things marked as Spam or Trash after a set amount of time, you will need to contact support and provide the email address you used to sign-up to play Spellbreak. This will enable us to find the key associated with your account.
Once you find your key, make sure to follow the installation instructions in the email in order to play Spellbreak on the Epic Games launcher.