I tried to install the Flash Player update (AdobeFlashPlayerInstaller_11_ltrosxd_aaa_aih.dmg) when prompted. However is stopped at 51% with the error "General Installation Error." I followed the all the suggested solutions including checking the requirements (OS 10.8.5 / Safari 6.0.5) uninstalling and reinstalling; logging in as a different admin; opening up "show package contents'; etc. Nothing is working, it still quits and now I don't have any Flash Player. Is there another solution?
You inadvertently deleted the mach_kernel file that was made visible with the 10.8.5 update.
See: http://forums.adobe.com/thread/1318151 for a solution that may or may not work.
A few hundred people did this (deleted the file) and most have had to reinstall OS 10.8.