Installer doesn't allow deselection of options to 'Help improve Opera by sending feature usage information' and 'Make Opera the Default Browser'. The checkboxes are un-de-selelectable. One caveat: I am running it on macOS26 beta, so this could be a beta OS issue, but I've seen others have similar problems with earlier OSs.

If Opera want to restrict these checkboxes, then they shouldn't be listed as 'options', because they're not. They're already hidden behind a dropdown in the installer. I feel that's a bit of a dark pattern, too. Maybe time to go back to Firefox or even Safari.