Activation problem on X Theme - Cannot use my purchase

Edit: The issue is solved, it is working now.

I purchased X theme yesterday, and trying to set it up to my website.
However, when I try to activate it, it redirects me to 's website to sign up with my envato username and licence key of my purchase.

After entering the details, I receive the following error message:

We’re having trouble connecting to the Envato’s server to validate your purchase code. Please try again in a few minutes.

Since there is no way to sign up to their website with another method, I cannot contact them to ask for support :confused:

This is not resolved. I cannot register my purchase. NOT happy.