Hello Astrid,
Thank you for your email and your interest in our services. Tickets for 2015 are not available yet for anyone, that is why they don't appear on the availability calendar and you cannot purchase them yet. You can come back the last week of December, it is usually then the government opens purchases for the next year. Or you can subscribe to receive the availability when purchases for 2015 are open: http://www.ticket-machupicchu.com/dispo/index.php?lg=en .
Best regards,
