Not sure which update to install

Looks like I have two basic choices for the latest updates: a unicode version and a non-unicode version.  First, I don't know what the difference is, and (yeah, okay, this is a little embarassing, but) I've never really understood what "unicode" is all about.  Anyway, it looks like the last update I installed was in this zip file: <pwrpro5.3_35n_setup.exe.zip>.  So, since there's a "35" in that file·id, perhaps I should install 
<pwrpro5.3_35r_setup.exe.zip>.  While I'm at it, I think there might be a typo on this page http://powerpro.cresadu.com/xdownload.shtml, fourth entry down — perhaps it should read, "Zip Install Latest Unicode" and not, "Zip Install Latest Non-Unicode."

 

 I think I'll go with …35r… but a little confirmation wouldn't hurt.
 

 Thanks,
 —Thri