The fact that you are installing that yourself rather than your host makes me think that you are either ...
1. Running your own online server ... in which case all the problems are your fault and not the plugin's fault.
2. Running an offline WAMP style server on your computer ... in which case, installing Alidropship plugin won't work.
If in fact you are using a hosting service ... contact their support. There have been other instances of Ioncube not being correctly activated on other hosts and the problem has been resolved by the users contacting the host. I'm surprised this wasn't your first action ... unless point number 1 above applies.
The instructions for installing the Alidropship plugin DO work. At least for several thousand others. That would indicate that the problem is with you or your website host. Hardly an excuse to demand a refund in bold, loud writing ... lol
BUT ... Installing Ioncube on whatever server you are talking about is NOT an Alidropship issue ... it's an issue with whoever is running the server you are on. Whoever they are ... they're incompetent and you should be loudly demanding a refund from them if they can't resolve the matter ... and move to another host.
Unless of course it's you running your own server ... in which case you need to study more on how to set it up correctly, or give up and use a paid host.