Files are unpacked means it won't be bootable ISO. All you need to do is:
- Open older bootable Windows 10 build iso file with UltraISO or similar application
- Delete all files inside and put the new downloaded one from here instead. (You can drag & drop)
- Save as 10056.iso or whatever you want it name it and now you have bootable ISO that can be used to clean install via USB or DVD!