Hey Rikard,
I think you did not understand the problem. I know where I find the theme registration. BUT:
I have purchased the Enfold theme for three customers via Themeforest. However, for the last two purchases, when I enter the purchase code in the theme, I receive the information that no connection to Envato can be established. Accordingly, I do not receive any updates for the theme despite purchasing a license. What is the reason for this and how can it be changed?