Windows 8.1 is now available for download.Windows 8.1 is a free update for windows 8 customers.
Boot to desktop option.
Start button and it opens the start screen.
Single unified search engine.
improved multiple monitor support.
improved start screen personalization.
Direct X 11.2.
Notes:You can’t upgrade from windows 8.1 preview to the final windows 8.1.
Windows 8.1 ISO images are not yet available.