There's a program in the UAE archive to get it (transrom?), but you still need to get the program onto a disk readable by your Amiga somehow. Easy if you've got Workbench 2.04+ or any system with CrossDOS.
I'm guessing, however, your A500 is just a Kickstart 1.3 machine. Either way, anything less than Kickstart 3.1 is no good for modern Amiga stuff, so you really ought to look at just biting the bullet and buying the emulator.
