Exactly as I said.
Open a terminal in the DEBS folder. Either using cd from the terminal, or, recent versions of the file browser include a right-click option to open a folder in the terminal.
In the debs folder:
type:
Alternatively, try
Code:
sudo apt-get install libreoffice
That will install whichever version of "libreoffice" is available in the software center.
apt-get is kind to you, it doesn't ask you to name packages using the version numbers and 32/64-bitness and stuff, just the name. Like "libreoffice" or "firefox" or stuff.