Once you have seed, You can retrieve Private Key with Agama or Paper wallet.

Steps to reproduce : --

  •  Download Komodo Paper wallet generator extract Zip file  –  Link 
  •  Switch your internet connection off and open 'index' file with a browser
  •  Go to Brain wallet tab, enter your Seed/Passphrase and select checkbox  "iguana compatible" and click on view


                                     


  • save your private key some where safe.