In order to upgrade themes purchased in Envato, a plugin need to be installed and setup.
Install Envato plugin. Go to settings and insert API as per procedure below:
Sign in to Sign In | Envato Account
Create a personal token called the name of your site and give listed accesses below
Name of token - Domain name
This token has access to:
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View and search Envato sites
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Download your purchased items
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List purchases you've made
Create API token, save code and insert into envato plugin on the site.
For more information, go to Envato Market WordPress Plugin