Good evening and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the struggles you have faced while trying to register your version of the plugin.
I would love to help you with this topic.
The first thing I would recommend is to download the premium plugin from your account’s downloads page
Once that is done, you will need to upload it to your website and activate it.
Finally, this will result in a license tab to be available at Events -> Settings -> Licenses.
You will then be able to enter your license number and get update notices.
Let me know how that goes.
Best regards,
Geoff B.