Hi River. I'm Greg, awarded MVP for eleven years, Volunteer Moderator, and Independent Advisor here to help you until this is resolved.g
What makes you think it was deleted? It's an important system component and cannot just be deleted without a lot of trouble.
Anyway there's no way to redownload, just repair System Files by running the System File Checker from Step 10 in this checklist:
http://answers.microsoft.com/en-us/windows/wiki...
If nothing else works then do a Repair Install, by installing Media Creation Tool, open tool and choose to Upgrade Now. This reinstalls Windows while keeping files, programs and most settings in place, is the most stable method to advance to the latest version, and solves most problems. http://windows.microsoft.com/en-us/windows-10/m...
I hope this helps. Based on what you report back I can answer any questions and may have other steps to perform.
______________________________________________
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.