It costs around €30 to upgrade from Freelance to Freelance Plus. To answer another question I believe you asked, you can have two different operating systems as the license is not dependent on the environment. You can find more on supported environments here:
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The system lets you keep client/vendor database, with contacts and rates, manage projects and assign jobs to vendors, issue invoices, track payments, store and manage project files, generate business reports on turnover profit per client/manager etc.
Modern desktop project management for freelance translators
BaccS makes it easy for translators to manage their projects, schedule tasks, create invoices, and view highly customizable reports. User-friendly, ProZ.com integration, community-driven development – a few reasons BaccS is trusted by translators!