Yes, you can download freely the extension as mentioned into "Where to download the extension?" article. However be aware that any support which may be needed like installation, configuration, customization or problem due to third party extensions, misusing or code changes will be charged.
When does the charge apply? We can tell you only when we will see it. However we will provide a quote after a first talk with you and before to do anything to prevent you any surprise.
Please contact us for more details.
We do not provide support per telephone, except if we call you directly to assist you more precisely via Team Viewer or Skype