Hi Edward,
Sorry to hear that it did not work on the first try.
When you say there’s no way to restart the download, did you try to force check for updates (settings->about->check for updates)? If you don’t get any updates, then our provider for Windows Hello has been installed successfully (you can check in add/remove programs, there should be a entry for Tobii Face Authentication for Windows Hello).
Let me know how it goes and I’ll help you with troubleshooting if need be.
Denny