Download Adobe Flash player tar ball.

[root@www2 ~]# cd Desktop/

[root@www2 Desktop]# ls

install_flash_player_11_linux.x86_64.tar.gz

[root@www2 Desktop]# cp install_flash_player_11_linux.x86_64.tar.gz /tmp
[root@www2 Desktop]# cd /tmp/

[root@www2 tmp]# ls
install_flash_player_11_linux.x86_64.tar.gz

[root@www2 tmp]# tar -zxvf install_flash_player_11_linux.x86_64.tar.gz

libflashplayer.so
readme.txt
usr/
usr/bin/
usr/bin/flash-player-properties
usr/share/
usr/share/pixmaps/
usr/share/pixmaps/flash-player-properties.png
usr/share/kde4/
usr/share/kde4/services/
usr/share/kde4/services/kcm_adobe_flash_player.desktop
usr/share/applications/
usr/share/applications/flash-player-properties.desktop
usr/share/icons/
usr/share/icons/hicolor/
usr/share/icons/hicolor/32×32/
usr/share/icons/hicolor/32×32/apps/
usr/share/icons/hicolor/32×32/apps/flash-player-properties.png
usr/share/icons/hicolor/22×22/
usr/share/icons/hicolor/22×22/apps/
usr/share/icons/hicolor/22×22/apps/flash-player-properties.png
usr/share/icons/hicolor/24×24/
usr/share/icons/hicolor/24×24/apps/
usr/share/icons/hicolor/24×24/apps/flash-player-properties.png
usr/share/icons/hicolor/16×16/
usr/share/icons/hicolor/16×16/apps/
usr/share/icons/hicolor/16×16/apps/flash-player-properties.png
usr/share/icons/hicolor/48×48/
usr/share/icons/hicolor/48×48/apps/
usr/share/icons/hicolor/48×48/apps/flash-player-properties.png
usr/lib/
usr/lib/kde4/
usr/lib/kde4/kcm_adobe_flash_player.so
usr/lib64/
usr/lib64/kde4/
usr/lib64/kde4/kcm_adobe_flash_player.so

[root@www2 tmp]# cp libflashplayer.so /usr/lib/mozilla/plugins/

or

[root@www2 tmp]# cp libflashplayer.so /usr/lib64/mozilla/plugins/
[root@www2 tmp]# cd /usr/lib/mozilla/plugins/

[root@www2 plugins]# ls
libflashplayer.so libtotem-cone-plugin.so libtotem-mully-plugin.so
librhythmbox-itms-detection-plugin.so libtotem-gmp-plugin.so libtotem-narrowspace-plugin.so