It is hard to continue development and support this plugin without contributions from users like you.
I spend a lot of hours every month in order to add new features, fix bugs, answer forum tickets, and write documentation so that you can use a full compatible plugin.
I try to keep the plugin free and offer good documentation and support for its users.
So, if you are using this plugin to build projects, please don't forget to donate. This way, I can continue working on this plugin, improve it and implement new features.