ADFBlitzer does not need to be copied to Workbench, but it will only work with Workbench 3, which I forgot to mention before. It should run from where ever you like, but as you will be placing a blank disk in the Amiga's floppy drive you should probably copy it to the Workbench disk.

I can't remember if ADFBlitzer supports ZIP files or not. If not then you can download the shell utility UnZip from http://www.paulkienitz.net/amiga/unz550xA.lha, but try using TransADF first.