We have added Inventor in Product Design Suite Standard 2013 [PDSS]. Due to this addition there has been some confusion around the previous versions of Inventor allowed to run with the new PDSS subscription (Package) license. Final change to the license has been done on 31 July 2012.
If you are on subscription and you have been issued a PDSS licenses prior to 1st August 2012, please re-issue the licenses to use previous versions of Inventor as documented here.
Licenses be obtained online at https://registeronce.autodesk.com