It is a paid extension, not free.
You can use it for free for the testing puproses only.
Please read the testing policy before installation.
How to buy
The extension is not released yet, so there is no way to buy it just now.
The extension will be released before 2017-06-04.
Installation
Free installation service
If you have already bought the extension, then its installation is a free service for you. Just provide me an SSH access to your store's server. You can use my public SSH key for it.
It is possible: the price depends on a extension and starts from $6.990.
You will get free lifetime support, updates, and installation service for all your clients.