Yes, since WHMCMS v2.3.0 the module it fully compatible with WHMCS v6+.

Yes.
If you have an active license of our module you will contact our Support Department and they will provide you with unique Dev License key to be used in your development installation of WHMCS.
Yes, please contact us regarding your requirements.
Yes, our module work with both default and custom WHMCS templates.

You can send requests for assistance and support to the technical support department.

No, the design templates and translation files sources included modify them as you want either the rest of the files are encrypted by Ioncube.

Yes, you can send a request to refund the cost of the module within 30 days from the date of purchase, to apply for refund, please fill out this form and submit it.

You can install the module by following the instructions on this page.

You can update to the latest version by following the steps on that page or by following the instructions that came with the latest version.