To assign the app licenses to users, you need to follow the below steps - 

  • From Setup, enter Installed Packages in the Quick Find box, then select Installed Packages to find the installed package that has available licenses.
  • Click the Manage Licenses link next to the Quick Update Translations name.
  • Click "Add Users".
  • To select individual users, use the checkboxes. Selected users are listed in the Selected list. When the list includes all the users to whom you want to assign licenses, click Add. 
  • To select all users for the current view, click Add All Users button, then click OK.