A customized installation is created by allowing a user to select a pattern of software. Then software that is installed on another user's computer is identified. If the identified software belongs to the selected pattern, then an installation of the software is obtained from a database and built into a custom built installation. The identification of the software and selection of a corresponding installation includes identification of a version of the software. A requested pattern can describe the category of use of the software, or the pattern can describe a usage history. After building the customized installation, the customized installation can be installed on a new machine.