Here’s a detailed write-up on , an official pre-release version from Microsoft’s Windows Insider Program. Overview Windows 10 Build 10074 is a Technical Preview build released to Windows Insiders on April 29, 2015 . It belongs to the fbl_impressive development branch and was one of the last major builds before the Windows 10 RTM (build 10240). The 64-bit ISO was widely distributed for testing on physical hardware or virtual machines.
: Run in a VM with network disabled, system date set to pre-October 2015, and no sensitive data. Windows 10 Build 10074 Iso 64 Bit