Is There a Standalone Installer for Bonjour for Windows?
Can Bonjour for Windows be separately installed, or is it only available to Windows users with iTunes?
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The last standalone installer is over 13 years old. Install Bonjour with iTunes. If needs be you can extract the Bonjour .msi file from the iTunes installer using 7 Zip. I suspect you may also need to install Apple Application Support. I've no idea what software apart from iTunes has any use for Bonjour these days.
tt2