Hi mennostam,
I’m sorry it’s not working for you.
It’s possible you hit something of a temporary blip and all you need to do is try again: best I can tell the system is working and looking through our records I can indeed see a bunch of newly purchased licenses that have already successfully been validated.
If you continue to hit up against difficulties it may be that some sort of environmental issue is impeding communication with our server – however please be assured that you will continue to have access to support for as long as your license is valid and you can also access updates as and when they are released from this page (and install them manually).
In no way will the functionality of your plugin – besides access to automated updates – be impaired by this.