Method 1: via The Envato Market Plugin
Step 1: Make sure you have installed the plugin Envato Market (packed in the theme)
Step 2: Make sure that all your customizations are NOT added in the parent theme (Core files, translation files etc.), otherwise you will loose all of your customizations once the theme has been updated.
Step 3: Go to WP Dashboard -> Envato Market
Step 4: Follow the instructions of the video below
Method 2: via FTP
Step 1: Go to your downloads page by clicking here.
Step 2: Download the “installable WordPress file only”.
Step 3: Unzip the downloadable file.
Step 4: Log into your server via an FTP software (Use a FTP client like FileZilla).
Step 5: Go to the folder your-domain/wp-content/themes and the replace the parent theme Cariera with the new unzipped Cariera folder.
Update the Core Plugin
After updating the theme most of the times you will have to update the Cariera Core plugin too in order to take advantage of the latest features, improvements and fixes of the update.
Step 1: Go to WP Dashboard -> Plugins -> Installed Plugins
Step 2: Deactivate the plugin Cariera Core
Step 3: Click on Update Required
Step 4: Make sure the plugin is activated
Follow the same steps for any other included premium plugin that might have available updates.