It is important to note that from official Autodesk sources . Autodesk officially supports and provides downloads for only the current version and up to three previous years. Official Download & License Status
: Versions from 2014 and older, including AutoCAD LT 2011, are officially retired. AutoCAD LT 2011 Free Download
: Since July 2022, Autodesk has stopped authorizing new installations of software versions 2014 and older. This means even if you have the original installer, you may be unable to activate it on a new computer. It is important to note that from official Autodesk sources
: Technical support is only available for the current release and the three most recent prior versions. How to download available previous versions - Autodesk including AutoCAD LT 2011