How do I upgrade a Windows 8 machine without a network connection to Windows 8.1?
Download a Windows 8.1 ISO (when you have access to it via MSDN/Technet), mount it inside Windows, run the setup.exe and select "upgrade".
setup.exe
A MVP suggest you to use this third-party solution.
By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy