Ah yes Amiga Sneakernet:
Get ADF2Disk from Aminet, works great. Even has a GUI for WB.
Just download the .zip archive, store on a 720k PC disk. (for larger zips you may need to span them. I usually use the split/join commands on the zip and transfer, yes a pain. But now I have a Amiga on my network so don't need to do this anymore) Then you will need to read this disk on the Amiga. You will need CrossDOS or AmigaDOS 2.x +. Mount PC0: then copy or unzip the .zip to RAM: or a HD. (Note 1MB RAM or more is needed, or a HD) Once the ADF is unzipped use ADF2Disk or similar to copy the image to a real disk! Good luck.