Please select one or more themes to update. (Error to update NewsPaper Theme)

Hi, I have installed with my license the NewsPaper theme in AltervistaBlog:
https://i.imgur.com/l11wRxB.png

However I can't update it from the theme dashboard, as I get the following error:
https://i.imgur.com/A7PUqAt.png

As expected, it does not throw me any theme update from the native wordpress dashboard.

How can I fix it?

Did you unlock the server to server connections? (from Settings)

It should be "External access without restrictions".

Bye!