If you need an invitation letter to attend EuroCon 2015, please, send and email to:
Héctor Quintián (hector.quintian@usal.es)
giving all the details related to your paper: Id, title, authors, affiliation and also including the proper information about where to send it.
Also, please say if you need only a scanned version of the letter or if you need the original letter send it to you via mail.
Take into account that you should be register and had paid the conference fees in order to send an invitation letter.