Since the standalone download is no longer supported, you can access the same automated fixes through these built-in features:
In an admin Command Prompt, type DISM /Online /Cleanup-Image /RestoreHealth . Advanced Recovery and Support Tools microsoft fix it tool windows 8.1 download
If automated troubleshooters do not solve the problem, you may need more comprehensive recovery options: How to Fix Common Windows 8 Startup Boot up Problems Since the standalone download is no longer supported,
While some third-party sites still host archived versions of the legacy tool, they are often outdated and may not function on modern installations. Instead, Microsoft has integrated diagnostic and repair capabilities directly into the Windows 8.1 operating system. How to Use Built-in "Fix It" Tools in Windows 8.1 microsoft fix it tool windows 8.1 download
