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Change from Slackware-14.2 (32-bit) to Slackware64-15.0 (64-bit)

Boot from Slackware-14.2 USB install stick

mkdir /myraid
mount /dev/md1 /myraid
mount /dev/md5 /myraid/usr
mount /dev/md6 /myraid/var
mount /dev/md7 /myraid/home

mount --bind /dev /myraid/dev
mount -t devpts devpts /myraid/dev/pts
mount -t proc proc /myraid/proc
mount -t sysfs sysfs /myraid/sys

mount USB with Slackware64-15.0
mkdir /myraid/usb
mount /dev/sdc1 /myraid/usb

chroot /myraid

cd /usb/slackware64/a
installpkg kernel-huge.t?z installpkg kernel-modules.t?z

reboot

uname -m should prints ‘x86_64
mount usb stick to /mnt/usb

cd /mnt/usb/slackware64/
installpkg a/aaa_glibc-solibs-2.33-x86_64-5.t?z
installpkg a/aaa_libraries-15.0-x86_64-19.t?z
installpkg a/aaa_base-15.0-x86_64-3.t?z
installpkg a/aaa_terminfo-6.3-x86_64-1.t?z

install rest of packages
installpkg */*.t?z

reboot. Now you are running a 64-bit system.
get rid of the old 32-bit packages:
removepkg /var/adm/packages/*-i[456]86-*
check the *.new files