Hello Alberto,
The updating script is placed on the local machine in our office. Since the situation in our country, we can't visit our office and get files, it is not safe.
So, at the moment Gridbox updates can be done only manually. Please check "Method 3: Update from Downloaded Archive", here:
www.balbooa.com/gridbox-documentation/how-to-update
Sorry for the inconvenience and thank you for your understanding.
Regards,
Artem, Balbooa.com