not sure what you mean.. I just did the following as per my previous post:
from the link you provided: http://archive.recalbox.com/updates/v1.0/unstable/
in which I downloaded the Raspberry Pi 3 image recalbox.img (sha1) using link: http://archive.recalbox.com/updates/v1.0/unstable/rpi3/recalbox.img.xz.sha1
I unzipped the IMG file and loaded the image on a fresh new Micro SD card using Win32DiskImager and rebooted the system.