The Windows 10 Anniversary Update (version 1607) introduced significant security enhancements. By requiring this version as a baseline, Adobe ensures that Photoshop is running on a system that supports modern security protocols. This protects users from vulnerabilities that exist in older, unpatched OS versions.
As of my last update, here are some general guidelines for Photoshop's system requirements on Windows:
If the number is , you are good to go. If it is lower, you need to update.