What you are trying to do is install a robust application on an OS that is
meant to be lightweight. It is a contradiction that is obvious to most
experienced Linux users. You installed antiX because you had little choice
due to old hardware and now want to install something that many users
consider to be bloated on it. Most people in your position would not
consider adding OOO.

I am not saying that it can't be done, but it may not be as easy as you make
it sound. Even in Windows applications expand in size through time. MSOffice
2002 is not the same as the current version which could not run on Windows
98.

AntiX is not an Ubuntu derivative. You might find more help on another forum
such as Mepislovers.org. I have MEPIS installed, but the full version (8.5)
and have OpenOffice is installed in it without a problem. I don't want to
sound like I am passing the buck, but you will find Ubuntu users here in
great numbers and I suspect not much else.