You can successfully deploy Flash Player for Mac clients using the Adobe's preffered method with a little tweaking of the application bundle: Installation via the extracted pkg from within the application bundle does not update the Adobe Flash Player Installer Manager application located in /Applications/Utilities if it already exists, which can cause issues with inventory and reporting of an otherwise successful managed installation. Adobe's only officially supported method of installation of Adobe Flash Player on OS X clients is via the installer application bundle in the Install Flash Player.
