Microsoft yet to officially release the Windows 8.1 update globally but an accidental leak made the Windows update available through various torrent and file downloading websites now. Microsoft has uploaded these files to their download servers and some people actually downloaded the file and uploaded it to file sharing services. Windows 8.1 is still not officially released by Microsoft but the copy accidentally leaked believed to be the final release of Windows 8.1 update.
You may download windows 8.1 update from above link at your own risk. There are rumors that microsoft may release Windows 8.1 free to download world wide with an exclusive edition but no confirmation or news yet from Microsoft. Windows 8.1 will get a refreshed new Metro UI. Microsoft made many changes to Windows 8.1 update mainly keeping in mind about non touch screen users.
Windows 8.1 will also boot right into the desktop just like Windows 7. No tweaks or hacks required anymore. Microsoft is expected to release the Windows 8.1 update by April 8th, 2014. Thanks for reading and have a good day.