Subscription Manager for Joomla! is not working properly!

Ahhhhh.....fuck, fuck, fuck. The extension I have just bought does not work properly. First of all, it does not install properly. Second of all, it does not forbid a page. This component seems to be still on development and is not ready for sell...

Well, the extension uses GPL licence and I paid for the copy of it. Therefore, I am going to resell it after customising the logic. I hope this action is going to help some people and motivate the original developers to fix the problemS.