Hi Zeeb,
What about manually updating the files..?
You can download v4.5 files over on the PB forum over here...
https://forum.powerbox-systems.com/f...357#post111357
Just place the 3 files onto a USB stick and then plug it into your Core.
You then just copy them from the USB stick to the Update/Receiver folder on the Core using the inbuilt file manager.
Just go straight to v4.5.... no need to update in intermediate steps so the other versions are not needed.