Hi Vunit Kher,
Unfortunately Internet Explorer 11 is not supported in Windows 8 or Windows 8 RT, If you want to install Internet Explorer 11, you might have to update the OS to Windows 8.1 or Windows RT 8.1.
Update to Windows 8.1 from Windows 8
http://windows.microsoft.com/en-us/windows-8/update-from-windows-8-tutorial
Regards,
D. Wu
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