First of all, I don't recommend to copy and to use downloaded files for flashplayer. Use the packages from the repositories instead.
Second, I personally like more the adobe propietary plugin, you can install it through your favourite package manager (sudo apt-get in the terminal or ubuntu software center as GUI, as an examples). search for adobe-flashplugin.
If you don't find result with such name probably you have to activate the non-free repositories, do it with the software and sources tool (use dash to search for it).
If you have already installed flashplugin-installer, probably it'll ask you if you want to replace it. press yes.
Other option is to reinstall flashplugin-installer, you can do it through the terminal typing:
sudo apt-get install --reinstall flashplugin-installer