As I say below, OO and LibreO are both free and easily available.
For what little it's worth, I wrote the following:
As I understand things, most of the developers of OpenOffice took offense at the transfer from Sun Microsystems (when Oracle bought Sun) and shortly transferred OpenOffice to Apache ,,, an umbrella for open-source software.
Many of the former OpenOffice developers started LibreOffice, keeping the same names for the components and continuing the version numbers. So much, so good. [Libre as in free - ¡Cuba Libre!]
I'd guess that Sun did quality control. I wonder how much quality control remains the farther the developers get from Sun.
Some Linux distributions come with OpenOffice and some with LibreOffice. The widely distributed Ubuntu comes with LibreO... But, then again, Ubuntu did a "Microsoft" and drastically changed its human interface a year or so ago. That makes me doubt their dedication to maintaining a familiar huiman interface for LibreOffice.
As I said, YMMV. Both are free and available from NINITE.COM. Ninite is an excellent place to get legitimate free Windows software. I have downloaded LibreOffice. It seems to demand more processor umph than OO. That's not a problem on recent computers, but would perhaps matter on an old and weak one.
Good luck,
seacue