Hello, i am newbie with an inventor, I have installed Autodesk Inventor 2012 version and started to learn some features. I Assembled an easy construction an now want to stress it for strenght. But when i enter Environment menu there is no Stress analysis option! Please help, how to install that add-in or how to make that option appear? Thanks in advance. 

Hi, you have to installed Autodesk Inventor Professional.