AutoCAD LT Installation provides instructions about how to prepare, and then install AutoCAD LT 2011. If you have never installed the product before, you should familiarize yourself with the entire installation process and options before beginning.
If you have a previous release installed, you should review the Migrating and Customizing section, so you can take full advantage of your custom settings.
For information about network-licensed versions of the program, see Choose an Installation Type.