I don’t have a solution but I discovered this workaround that was working:
You can assamble the backup files from URBackup into a single VHD (https://www.urbackup.org/administration_manual.html#x1-9400010.7)
This VHD can be restored with an Acronis boot CD.
If it does not boot you need to repair the boot sector. For Windows it can be done with the Widows installation DVD.