Hi macamacaron & Catalin
Thank you for the reply.
I read the sweetdate document about the upgrade issue.
It said.
To easily update the theme using Envato update plugin you must go to WP-admin -> Sweetdate -> Miscellaneous and enter your Envato username and API Key. After you have saved the settings you will receive update automatically.
Where to get the API Key?
I found a “http://marketplace.envato.com/api/documentation”
Not easy to understand it.
Any suggestion?
Thank you!