Hmm... probably your best bet would be to find a cafe that has Memory Stick readers built into its PC's. (or failing that, go to your local electronics market and buy a USB-based Memory Stick reader) You'd also need an actual Memory Stick, assuming you don't have one already.
Using that, you could simply copy the software's data files (from the "manual install" version) to the /Palm/Launcher directory on your Memory Stick, then copy the files that need to go in RAM (Oxford Dict.prc and all of the HWR files) into your Clie's memory using MSGate.