What is System File Checker (SFC) and how can it help with the 0x80072f8f error?

System File Checker (SFC) is a built-in Windows tool that scans for and replaces corrupted system files with their known good versions. Running SFC can repair damaged files that might be interfering with the Windows 10 upgrade process, potentially resolving the 0x80072f8f error. Open Command Prompt as administrator and run the command `sfc /scannow`.