If you are unable to download Autodesk Mechanical Desktop 2009 from the official Autodesk website, you can try the following alternative sources:
Because MDT 2009 was discontinued years ago, obtaining a verified installer is no longer as simple as visiting a standard product page. Official Access
MDT 2009 was the first (and only) version to offer a native 64-bit version, significantly improving performance for large assemblies. Technical Requirements
You will likely never find a 100% "Autodesk-signed verified" download of MDT 2009 on a public website. The closest you can get is a clean ISO from Archive.org with a matching community hash.
Allowed for dimension-driven changes, where updating a value automatically adjusted the geometry.
If you are unable to download Autodesk Mechanical Desktop 2009 from the official Autodesk website, you can try the following alternative sources:
Because MDT 2009 was discontinued years ago, obtaining a verified installer is no longer as simple as visiting a standard product page. Official Access
MDT 2009 was the first (and only) version to offer a native 64-bit version, significantly improving performance for large assemblies. Technical Requirements
You will likely never find a 100% "Autodesk-signed verified" download of MDT 2009 on a public website. The closest you can get is a clean ISO from Archive.org with a matching community hash.
Allowed for dimension-driven changes, where updating a value automatically adjusted the geometry.
You can find a more exhaustive list of contributers on the wiki.