The standard written tutorials that run in the Web browser are retired for 2016. You can still access the tutorials from the Inventor 2014 and Inventor 2015 online help.
Continue to increase your knowledge of Inventor by following the guided tutorials available from the Get Started tab - Videos and Tutorials panel in Inventor.
New guided tutorials are available for download throughout the year from here. Guided tutorials provide a no fail learning experience that runs inside the Inventor application. These tutorials lead you through information in a side panel with step by step video, text, and model files. In-canvas visual clues linked to the text in the panel point to commands and other information.
Autodesk now maintains a site with links to free 30-day trials from online training publishers. Each of these online training publishers provide 30-day free access to their entire library of content. Registered Autodesk customers are eligible.