Licenses are per domain, but work for all sub-domains of your site (so an example.com licence will work on de.example.com, en.example.com, etc).
If you require a license that covers multiple domains (e.g mybuisness.co.uk, mybuisness.fr) then we can generate the licence for you! As long as all the domains are part of the same company site/installation. Simply purchase a licence for the primary domain and drop us a line to get the additonal domains added.
Translation Manager works with Umbraco v7-v15. Your purchase will include license keys for all versions of Translation Manager v7 - v16.