I think you should take the time to do more research on flashing roms and how to SBF if your asking for help on this.
LibertyX/2-X.X.zip - This means you need the correct zip form the first post. Either the zip for the Droid X or the Droid 2.
TheameName.zip - Is a generic name for any theme. Take
this theme for example. The part referencing ThemeName.zip is, as it would indicate above the steps, if for Installing themes or Addons like the theme i just linked to.
You can seriously screw up your phone beyond repair by trying to install these things if you have no idea what your doing. Please make sure you understand fully how to flash a rom, flash a theme or add on, and how to SBF(check the droid 2 hacks forum most likley).
EDIT: I see your other post, you might want to clarify on your profile you have the R2D2 version of the Droid 2. It is safe to flash this rom, I believe, but keep in mind you will loose certain things custom on the R2D2 version that I can not recall of the top of my head. You have jumped head over heels in to this with out confirmation it was safe to even flash this. Perhaps you did your research and found something to indicate it was safe, but if not, then again, I emphasize you need to research this further as you seem to be rushing in to this haphazardly and run a higher risk of bricking your phone.