Cannot install flash player update.

When I turned on my computer today I got the popup telling me to update my flash player. I clicked on Install, it opened Firefox and the dialog box where I clicked on Save File. But when I opened my Downloads folder the download of the installer had failed. I tried twice more with the same result. I have installed flash player updates many times in the past with no trouble, so I cannot figure out what is happening this time. Any help is appreciated.