I have exactly the same problem when trying to update Opera 133.0 to 134.0 on macOS 26.5.2. This is clearly complete nonsense, since I am capable of accessing information via the interwebs, in all cases apart from the Opera Installer. How do you think I obtained the Opera Installer? Do you think I downloaded it over a non-existent network connection? Come on guys, this shouldn't be rocket science

And don't even get me started about the convoluted steps needed to create a login so that I could post this message