Accessing the Odoo online version is simpler than all its previous versions. You can start with a single application, which is free for unlimited users. The instance created with the first application needs to be activated, as it expires in 4 hours if it is not activated, and all the changes made in the instance will be lost. You will not be able to go back to the free subscription plan on the installation of the second application; you will be notified when you are about to install the second application.