All extra modules can be downloaded (if they are free) or purchased (if they have commercial licence) in epesi store.
http://epe.si/extension-modules
"Commercial Premium Modules" - is not a module but general term.
"Contracts" module is not available yet.
kakalo - please find someone who can translate english for you. Using Google Translate is not working. If you don't we will have to start ignoring your posts 🙁
