Bingo !! 😞 .... Thank you for your order. There is no need any activation from my side, but the problem is which site are you seeing 😞 ....
Yesterday I moved server and thus I updated my nameservers. Some friends around the world, that I asked to check it, they're seeing the new server. But still, I'm seeing the old site.
In anycase the links are the same. Can you see anything at:
https://www.christeris.com/products-services/whmcsbb.5/product-purchases
If yes, then click activate to enter your domain. I'm not using any license manager or license check, is just how that script works. When you enter the domain name, you'll be able to download it.