If you have a previous version of AutoCAD installed on your system, you can install AutoCAD 2008 and keep other versions of the program on the same system. This is called side-by-side installation. If you've purchased an upgrade version of AutoCAD, you are required to uninstall the previous version within 120 days of installing AutoCAD 2008. See your license agreement for more information.
In this section, you learn about migration from previous releases, using customized files from previous releases, and locating customized files.