However, if you are a die-hard legacy user with an active project on MDT 2009, the only reliable path is:
Autodesk stopped supporting it years ago, and it is not legally available for download from Autodesk or authorized resellers. autodesk mechanical desktop 2009 download verified
Yes, but with significant caveats. Because MDT 2009 is discontinued, you cannot simply buy it or find it on a standard trial page. Official Autodesk Source However, if you are a die-hard legacy user
If you are trying to open old MDT files, consider these more accessible options: consider these more accessible options: