Adobe Flash Player: Can't install, can't uninstall

The title says it all. I keep being prompted to "Update Adobe Flash Player right now". However, when I use the download links provided, I end up getting the message, "An  error has occurred...." Then, when I try to clean the slate by uninstalling the versions already in my computer, I get the same message: "An error has occurred...."

One thing I've learned is that Adobe's support service is a waste of time, for me, at any rate. This forum is my only hope, because I am unwilling to waste more hours going in circles trying to follow the "help" Adobe provides. Oh, one last thing. Here is the core of the error message I get.

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ffmpeg: av_find_stream_info failed

ps: cannot peek

main: no suitable demux module for `/:///Users/warrenjones/Downloads/install_flash_player_osx_ub-11.dmg'