In addition could you also provide the most up to date fixed width child theme? I found one on the link posted above but again if there is a newer version I would appreciate it. It would also be good for these child themes to be more visible on the website in general. They seem somewhat hidden to find.
Those are starter child themes, as such they don’t require many updates and they should still work fine. However, if you face any issues with those child themes email firstname.lastname@example.org with details.