After online option failed on me and this media option is also can't upgrade my windows 8.1 pro retail official activated. Tried Same error on setup. Code: 10240.16384.150709-1700.th1_CLIENTPRO_RET_x64fre_en-us.esd converted to en_windows_10_pro_10240_x64_dvd > Rufus > USB Tried Same error on setup Code: en_windows_10_multiple_editions_x64_dvd_6846432.iso > Rufus > USB after setup preparing show on purple window completes then this weird error.
@EFA11 oops missed that one yeah its x64 system and iso esd are also x64 & installed windows 8.1 pro x64.
have you tried to mount the iso and run setup from there for the upgrade? also check your hash of the iso. make sure it wasnt corrupt during your download.