１．make free partition  on Windows:
1.1 コンピュータの管理→ディスクの管理→WinC：（右クリック）shirink volume :~90GB

２．Debian9.9.0-amd64-iso-DVD boot

３．Aborted due to disc error, which turned out to be iso file downloading error.

４．Try again with bittorrent downloading and checked with sha256 checksum (in this case not necessary) and burned by ImgBurn with verify.  Successful but cannot realize dual boot.

５ minitool registraion was used up. Forced to attempt MBR recover using SystemRescueCD.

6. Boot SysResCD 64bit
6,1 /roo% fsarchiver prob simple
you will find sda5 has ext4 with label unknown:
% mkdir -p /mnt/linux
% mount -r /dev/sda5 /mnt/linux
check that linux exists:
% ls -l /mnt/linux/sbin/init
it does exist, it is a link:
/mnt/linux/sbin/init -> /lib/systemd/systemd

But;

BOOT.SDI is only one entry in boot directory