Over the weekend, Russian leaker(s) WZor once again proved their mettle by posting a new leaked Windows 10 build, the 64-bit only 10051, on the mail.ru website. Others rapidly took the leaked WIM file (stuffed in a RAR!) and turned it into an ISO for general consumption.
For the intrepid:
SHA1: B2047A5E620048BDC6FE415CEF0D8ECB8801D5E6 MD5: 3977F41313E7D1A7B2F9B710252FEEDD CRC32: C8A149B4
There’s at least one other ISO floating around that claims to be build 10051, but its hashes don’t match the verified ones here. The pedigree of that other ISO is unknown.