Difficulty installing Flash & Shockwave in FF & TB

Have U3 FF installed. but am unable to install FlashPlayer and Shockwave.

Downloaded Macromedia flashplayer & when attempt to install onto U3 flash drive receive msg, "http://ffdownload.macromedia.com/flashplayer/xpi/current/flashplayer~1.xpi
because download error.

Also Shockwave won't install. Have downloaded file shockwave_installer_slim.exe. When attempt to install window reads Windows can't find i\system\apps\3c9f7b~1\exec\firefox\firefox.exe 3c9f7bf-d55c. Is this attempting to install a file meant for PortableApps, not U3? And if so, where is the one for U3 found?

This is same difficulty as two days ago and thought it might be their website, but apparently not.

Similar difficulty with TB, except managed to drag the file npswf32.dll from the hard drive TB.
Miles