Changing PHP from 7.4.27 to 8.0.15 solved the error and I managed to update properly

This is fixed


This is NOT fixed, so my guess is that it must be something else blocking it


And finally the Documents -> CB Primer Book / CB GroupJive Primer Book / CBSubs Manual, remain with "Sign up"

EDIT: Connected to another Wi-Fi and the "CB Paid Subscriptions" is not updating locally and the same applies to the remote server (live server).
EDIT2: Published CB Subscriptions on another Joomla installation on the same remote server and same result, it appears in red