Emphasised “continue” or “default” buttons have been around for a long time. In a software installer, nonstandard options are often less emphasised than the standard ones. For instance when choosing an installation location it makes sense for the default option, which is fine for most users, to be emphasized. If the continue and change location buttons were equally prominent the user might believe that a choice must be made here or that you are expected to choose a location. The experience of installing is more streamlined, less confusing for the less technically proficient, and requires less cognitive load when emphasis is used well.
As I said in an earlier comment, something being a dark pattern is entirely a matter of context. If used to encourage the user to shell out for gems in a mobile game, it’s a dark pattern. If used to make user experience better, it’s just good UX.