The administrator has the ability to define which startup products have the ability to install the PRO version.
To do this, go to the System Settings -> Addon Modules and click "Configure" next to the "Brizy" module.
In the "Product names" field, enter the names of services separated by "," that will allow the user to install the PRO version. You can check the service names in System Settings -> Products/Services. The names entered in the "Product names" field must be identical to those listed in "System Settings -> Products/Services".