Have a look at http://msdn.microsoft.com/en-us/sub...Languages=en&PageSize=10&PageIndex=0&FileId=0 if you need to find the official file names and hashes.
EDIT:
File Name: en_windows_8.1_with_update_x64_dvd_4065090.iso
Languages: English
SHA1: 4652DC6EBFEBE02C6A63E167C36E3FAEDFB93999
Code:https://drive.google.com/folderview?id=0B1huEBZdd47ccWMtakhfcDlxS28&usp=sharing
Code:http://torrage.com/torrent/EDF9E874C70071203DFA7B3844DDA6CDCFC4C401.torrent
File Name: en_windows_8.1_with_update_x86_dvd_4065105.iso
Languages: English
SHA1: 54B8572556B316A6BECE54C5033564E3296F5951
Code:https://drive.google.com/folderview?id=0B1huEBZdd47ccWMtakhfcDlxS28&usp=sharing
Code:http://torrage.com/torrent/BBC17FEB235417FC8F252A82CCA2CD50F20D16CA.torrent
Have you got 8.1 professional?