I couldn't be sure on what you have added, but the code pasted at the very below part of addon_pmail_options.php
, should look like:
After logging in with your Customer details, you can use the Compiler
to build the compiled version of the miniBB with all of Premium add-ons you purchased. The Compiler generates the proper codes and so far doesn't withdraw downloads amount from add-ons. After compilation, you can compare all necessary codes for validity in your custom installation.