When you download Zero Install for the first time you get a so called Bootstrap EXE.
This is a stripped down version of Zero Install that uses the feed format to download and run a full version of Zero Install.
If you wish to install Zero Install in unattended/automatically (e.g., in a corporate environment) you can use:
zero-install.exe maintenance deploy --batchto install for the current user or
zero-install.exe maintenance deploy --batch --machineto install for all users.
Default settings can be integrated in the Bootstrap process via
See also: Blog post about Bootstrapper