Update v5.6.28 fails: ⚠ Failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

Hi Hillel.
Thanks for your reply.

Nope, I have changed nothing manually or tampered with the code.

We did have this issue before a few versions back:

Where we could not update and ended with running a forced update. But after that everything has been working excellently including updates. We have at least ran 5-6 version updates since then flawlessly.
Not so this time obviously.

Kind regards