As of 2025, Dell still supports this tool, but some legacy versions have been moved to the "Archived" section on their support site. If you cannot find it via search, contact Dell ProSupport – they can provide a direct link.
Before installing, ensure your host system meets these criteria: Dell Wyse USB Imaging Tool Version 3.5.0 User's Guide
In short: There is no reliable alternative.
Here is the exact path to navigate: