How can I manage users in a site license?
You don't necessarily have to! Once the maximum number of licensed users is reached, new users will automatically disable the oldest inactive account. This frees administrators from managing the Add-on users.
IMPORTANT NOTICE: If you want to re-activate disabled inactive accounts you need to pay $30 administration fee to reset your site license.
How to restrict which domain users are allowed to install the add-on
Your G Suite Admin needs to follow these steps:
Create an organizational unit. For example you can call it MMS Users.
Add users to this organization unit. These users will be the only ones allowed to install the add-on.
You don't need to do this step if you already have an existing organization unit (such as 'Sales Department') which serves the purpose.
NOTE: If your administrator is not in a position to do this, do not buy a site license. Instead you have to buy individual licenses. Otherwise other users in your site/domain can take your license.
How can my users install the add-on?
If you domain install the add-on this will automatically be installed for the selected users and it will appear under the Add-ons menu. Alternatively you can give them this link to install if from the G Suite Marketplace.