If a previous version of Reader for Mac has already been installed to your computer, launch Reader for Mac, connect your computer to the internet and select the Help - Check for updates menu and then update Reader for Mac to version 2.1.To ensure that no other program interferes with the installation, save all work and close all other programs.During the installation of this file, be sure that you are logged in as the Administrator or as a user with Administrative rights.Upon installation and launch the User will be prompted to “migrate” their existing Reader Library contents and database into the new Reader application.