Centarro Bootstrap is the Bootstrap 5 base theme that the Centarro site templates are built on. It ships a library of single-directory components that work in Drupal Canvas, theme settings that turn a brand's colours, fonts and logo into a finished storefront, and a focused checkout for Drupal Commerce.
The licence gives you Composer access to the theme through Private Packagist, with every update for one year. It does not renew automatically. What you install is GPL code and stays yours when the licence ends.
Not sure yet? The one-month trial gives you the same access for one month. It cannot be renewed; when it ends, switch to the 1-year licence to keep receiving updates.