Hello. Long ago, we purchased a site (https://www.riberadebreviva.org) that uses the Enfold Theme. This site has version 3.7.1, but I cannot update because cannot find any new version. We have a Themeforest username and Themeforest API Key.
Please install the Envato Market (https://www.envato.com/lp/market-plugin/) plugin, insert your API key in the plugin settings, and check if you’ll receive the update.
If you don’t, you’d need to manually update the theme (https://kriesi.at/documentation/enfold/theme-update/).
After updating Enfold, please refer to this post https://kriesi.at/documentation/enfold/theme-registration/#how-to-generate-a-envato-personal-token and insert a Personal Token in Enfold theme options so you’d receive further updates.