Installation is very simple. First ensure that you have the latest version of the F/A-18 Hornet 3.0 application (3.0.1b2). If you do not have this latest version then you may find an update at: http://www.graphsim.com/ftp/H301_Update_Mac.hqx. The STRiKE 3.0 Missions folder contains one installer. The installer changes the missions and you apply it to the "FA18Data" file. Note: MacOS registered users may download a second installer which changes the mission briefings, mission names, and mission awards in the F/A-18 Hornet 3.0 application. This is an optional file for MacOS registered users and they will receive further information upon registering. This file is available to ALL MacOS registered users of any mission set. Contact us for more information. Please remember to back up both the application and data files before proceeding. The installers will search for the appropriate files. Choose the file which is in your "F/A-18 Hornet 3.0" folder to update. Drag the Notes and Text replacements into their respective folders after you have installed the STRiKE 3.0 missions. You need these extra notes and texts to receive tactical information and correct end of mission messages from Headquarters. If you have any problems then please mail us at strike@kagi.com