Don't worry. Since 19th September, 2013, the license policy of Magestore has been changed into the license certificate policy. Therefore, we don't provide license key to customer anymore. Each License Certificate includes a license serial which is valid for one live Magento installation only and unlimited test Magento installations.
Therefore, you must NOT enter the license serial into the license key management section in backend (System/ Magestore Extensions/ License Keys). These fields can be left as blank. The installation process only requires license certificate generated in your Magestore account. In summary, if the system asks for license key, you can ignore and continue on the next steps