Dear Sir/Madam,
Latest version of advance steel is AS2015.1 and that can only be downloaded from Autodesk subscription account.
Kindly log in to your subscription account and download the desired version of Advance steel. Below is the link for Autodesk subscription centre.
http://subscription.autodesk.com/sp/servlet/public/index?siteID=11564774&id=11607975
for any query you can get in touch with us on following email address
pranit.tapse@graitec.com or rahul.dubey@graitec.com