I downloaded these ISOs (untouched) last year in Aug 2014 through names/ links/ suggestions non MDL forums. Code: 08/12/2014 12:26 AM 4,115,013,632 en_windows_8.1_with_update_x64_dvd_4065090.iso 08/12/2014 12:14 AM 3,581,853,696 en_windows_8_x64_dvd_915440.iso 08/11/2014 12:44 PM 4,006,621,184 IR3_CPRA_X64FRER_en-US_DV9.iso I just used 915440 and 406509 to go from Win 7 > 8 > 8. Used MTK These I intend to keep. Is the IR3_CPRA a newer or older release of 8.1 or a Non-US version? Should I get rid of it? I have another .ESD/ .ISO sitting in another folder. This is from an official download when I did the $14.99 Update purchase. I am keeping this SERIAL/ KEY safe until this whole Win 8 to Ten thing settles down. Also, Is there some way to check which Country/ Language the ISO or ESD belongs to if the name/ release long name is missing. I am wondering what release this .ESD (created .ISO) is and whether its worth keeping on the Disk?