I am failing to download the signed key in Debian Linux when running update-flashplugin-nonfree from the flashplugin-nonfree package. (Key not maintained by Ado

I am failing to download the signed key in Debian Linux when running update-flashplugin-nonfree from the flashplugin-nonfree package. (Key not maintained by Adobe...) Meanwhile I just noticed that my Windows Firefox plugins for Reader DC are not 2015.010.20060 but .20056. I leave these completely disabled at all times anyway. And nothing annoys me more than having to download the self-deleting autodownloader in Windows. What a total waste of time for something I rarely use these days...