The newest release, Inventor 2013, is out to download as a 30-Day Free Trial. If you are on subscription and can’t download it yet, or have an earlier version and want to check out the new features that Inventor 2013 has to offer you should check it out. Also, if you are a student, you can go to the Education Community and download Inventor 2013 or more than 30 other titles for free over there. Here is the link to download the free trial.
Inventor 2013 – Free Trial.
If you are not into using the full version of Inventor you always try a free trial of Inventor LT also. Here is the link to download the free trial.
Inventor LT 2013 - Free Trial