There is no limitation to the number of Projetex installations. You can install Projetex on any number of computers. There is only a limitation on the number of simultaneously connected users. 

For example: If you would like to have Projetex installed on 10 computers, but only 5 users at most will work with Projetex at any given time, then the best license for you is "Projetex - 1 Server, 5 Workstations".

You can order Projetex at http://projetex.com/order-translation-project-management-tool/new-license