Operating system will not update even from CLI

Hi, I have HA running on a NUC. Since operating system 3.9 I have not been able to update. I have tried with the CLI but get an “unknown” error. I see nothing in the logs.
I get the message 20-02-13 05:07:49 WARNING (MainThread) [hassio.hassos] Can’t fetch versions from https://github.com/home-assistant/operating-system/releases/download/3.10/hassos_intel-nuc-3.10.raucb:
I can download the file from my PC so this is good.
Can i point the update to the local file?
Are there further logs telling me why It will not download?
Is there a way to view the backend process as the where it is storing the file and what it is doing?
I am using an SSD drive so have plenty of space.
In a hope cleared the old db and logs to ensure there was nothing corrupt in the db.
Thanks in advance.