I downloaded the installer for Safari, but after it starts installing (at about 75%), it says "error installing update" or something like that.
I closed all browser windows (and other applications for that matter).
Flash is enabled in Safari (java etc. enabled).
I performed a clean install of flash (after downloading the uninstall app).
And then I downloaded the flash player directly from the help site.
I never had issues with flash before.
What to do?
First, download the offline installer from the direct download links here:
Once they're downloaded, reboot your machine.
Before you do anything else, run the installer you downloaded.
If it's still stuck, do you have any anti-virus/anti-malware software running on your computer?