Nowhere on the joomla extensions site, nor the main component site, does it mention you have to have IonCube installed and if you do not, you will break your entire site, and have to hunt down what was installed where, just to get the errors to go away long enough to uninstall it.
Expect lots of problems using this addon.
You have installed the evaluation version - it is encrypted and requires ionCube. This is stated very clearly when you are downloading the installation package.
The full version does NOT require ionCube.
We have no other reports of our evaluation version breaking the entire site. But these things happen - different PHP versions, configurations, etc. You could have contacted us, we would have solved it quickly.
There is no developer documentation, so if you are looking to add support for you favorite joomla extension just forget about it.
You will honestly be better off just spending the hour or two a week it will take to make a fully custom News Letter and using Joomla's built in mass email features.
We have provided great flexibility already in the product by providing plugin support. Adequate user documentation has also been provided. As said in our Release , we shall be providing developer documentation only after a month from release since we are refining it.
The requirements you had posted on the forum need custom development of additional plugins.. This you can do once the developer doc is out.
That plugins cant be copied is a Joomla Architectural constraint. To overcome this future versions will have support for modules as well.
As for support , if you need fast support via tickets, we have as support subscription available. We have made this product free & community supported via forums so that more people can benefit from it. But fast support is available commercially if you need it.