Could not find required data files

Zwift does not start. There is an error message, which says “Could not find required data files. Closing application now.”. What can I do?

Suggestion: If you are on a Windows PC, check the health of your hard drive. I had a similar error only to find out my hard drive was failing.
I re-mapped the “Documents” folder and it worked again…then there’s the trouble of swapping out a HD.

Yes, it is a Windows machine. SSD works fine. How to re-map that folder?

I had to Google it. I’m sure my explanation would be less effective than what you can find with Google.