New
#11
I now realize that the problem I had was indeed related to IE - the installer that did not work was Flash for IE. The other installer - Flash for other browsers - installed without a problem. I don't usually use IE, but on Windows 7 I typically install Flash and Java for IE also - just in case I might need it for some strange website that requires IE (although lately the number of such sites is greatly diminished).
The Flash in control panel is 32 bit. I do not use 32 bit browsers since I'm using a 64-bit OS. Perhaps that's why Firefox did not see it and I needed to install the plugin.