Needs Zen Studio installed (free from Cronus): open it once, then close it and keep it closed. Download the bridge, run it and leave it running. If Windows asks, choose “More info”, then “Run anyway”.

Plug the Zen into this computer using its PROG port, then press Connect and choose it in the window your browser shows.

Plug the Zen into this computer using its PROG port and leave it plugged in until the flash finishes. It takes about a minute. Each script goes into the slot you choose, so you can keep several on the Zen at once. Choosing a slot that already holds a script replaces it.