To access the downloaded interactive Tutorial (compatible with R2015):

1.	Download the Tutorial to your desktop.

2.	Double-click the tutorialname.exe  - this will install the files to the default install location.
	Typically <drive>:\Users\Public\Documents\Autodesk\Inventor 2015\Interactive Tutorial\<language>

3.	Open Inventor: On the Get Started tab, click the Videos and Tutorials drop-down arrow, and then click the tutorial icon to launch the new tutorial. 

Note: If the Videos and Tutorials panel is not available in the Get Started tab, click the panel drop-down and enable the panel.