Downloading is one thing.
Installing it is another entirely.
Download the Adobe Flash Player installer directly by right clicking the following links and selecting "Save target as" (IE) or "Save Link as"(Firefox).
Save the files to your Downloads folder - DO NOT run anything yet.
Reboot your system.
BEFORE opening anything, go to the Downloads folder and run the UNINSTALLER to remove all instances of Flash Player.
Next, run the ActiveX installer, and then the (other browsers) Installer.
Lastly, for Internet Explorer see:Enabling Flash Player in Internet Explorer and: ActiveX Filtering in Internet Explorer to make 100% sure that Flash Player is enabled and NOT being blocked by ActiveX controls.
Frankly, I’ve given up.