Dear all, Here is the link to download the old Windows 8.1 installer file for Z64-W Windows 8.1 edition: http://www.minixforum.com/downloads/download.php?file=Z64W_WIN8.1.zip (Package size: 3.46GB/3,724,962,599bytes) Installation instructions: 1.) Download the above .zip package with a download manager software with resume feature 2.) Upon completion, verify the size of the file is correct (Package size: 3.46GB/3,724,962,599bytes) 3.) Find an empty USB stick of 8GB or larger 4.) Format it as FAT32 filesystem 5.) Rename the flash drive as "WINPE" 6.) Unzip the downloaded package to the root directory of this "WINPE" drive 7.) Now your installation USB stick is ready 8.) Plug it to your Z64-W with the original 32-bit Z64-W BIOS (Not 64-bit Android BIOS) 9.) Press F11 during cold boot, choose the "WINPE" drive from the UEFI menu 10.) Hit Enter to confirm and let the installation to complete itself Regards, Team MINIX.