No your library component and template data is kept. DesignBuilder stores your templates and component library data in a series of .dat files which you can access from the 'File | Folders | Library data' menu command. These files are retained when the software is uninstalled and when you install a new version of DesignBuilder and run it for the first time, any data you entered in the old libraries is merged with the new libraries. This ensures that you keep any data you created, while receiving the latest DesignBuilder template and component data.