I boot the Mageia 6 Gnome Live x86_64 DVD successfully. Then I choose to install Mageia 6 and choose the harddisk where Windows 10 has been installed on the first 2 primary partitions. The Mageia 6 installer creates the hda6 partition and then it only shows error messages. It should have reduced the size of the Windows partition and install Mageia 6 on the free space.

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An error occurred
INTERNAL ERROR: unknown device sda8
MDK::Common::Various::internal_error() called from /usr/lib/libDrakX/devices.pm:131
devices::entry() called from /usr/lib/libDrakX/devices.pm:146
devices::make() called from /usr/lib/libDrakX/fs/format.pm:192
fs::format::part_raw() called from /usr/lib/libDrakX/fs/format.pm:114
fs::format::part() called from /usr/lib/libDrakX/fs/format.pm:281
fs::format::formatMount_part() called from /usr/lib/libDrakX/fs/format.pm:300
fs::format::formatMount_all() called from /usr/lib/libDrakX/fs/partitioning.pm:72
fs::partitioning::__ANON__() called from /usr/lib/perl5/vendor_perl/5.22.2/MDK/Common/Func.pm:314
MDK::Common::Func::catch_cdie() called from /usr/lib/libDrakX/fs/partitioning.pm:76
fs::partitioning::format_mount_partitions() called from /usr/sbin/draklive-install:187
main::ask_partitions() called from /usr/sbin/draklive-install:162
(eval)() called from /usr/sbin/draklive-install:162
main::ask_partitions_loop() called from /usr/sbin/draklive-install:65
main::install_live() called from /usr/sbin/draklive-install:42

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[live@localhost ~]$ cat /etc/mtab
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
devtmpfs /dev devtmpfs rw,nosuid,noexec,size=1928652k,nr_inodes=482163,mode=755 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev,noexec 0 0
tmpfs /run tmpfs rw,nosuid,nodev,noexec,mode=755 0 0
/dev/loop0 /run/mgalive/ovlsize squashfs ro,relatime 0 0
overlay / overlay rw,relatime,lowerdir=/live/distrib,upperdir=/live/tmpfs/memory,workdir=/live/tmpfs/work 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/net_cls cgroup rw,nosuid,nodev,noexec,relatime,net_cls 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=26,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=10992 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime,mode=755 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
tmpfs /tmp tmpfs rw 0 0
nfsd /proc/fs/nfsd nfsd rw,relatime 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=388164k,mode=700,uid=1000,gid=1000 0 0
gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sda6 /mnt/install ext4 rw,relatime,data=ordered 0 0
/dev/sda1 /mnt/install/media/win_c fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096 0 0
/dev/sda2 /mnt/install/media/win_d fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096 0 0