Unable to install Flash Player. System is MacOSX 10.6.8 with 2.4 GHz Intel Core 2 Due, browser is Safari 5.1.8. Always quit Safari to install. Downloads okay, "Install" seems okay, but doesn't install. Have tried to uninstall and reinstall (download again from Adobe) but still doesn't work, can't view any Flash content online. There is NO Flash Player in my Applications, and I've followed all the help tutorials on Adobe. HELP! This all began months ago when I chose to "upgrade"my Flash to the latest version.
What error messages are you getting when you see that it's not installing? Can you check your /Library/Internet Plug-ins/ folder to see if you have any files in there with "flash" in the filename? I'd also recommend verifying that you have "enable plug-ins" checked in Safari's preferences dialog in the security tab.