Confusion in Updating to Studio 1.2.6 Theme

Studio 1.2.5 contained both themes/studio and themes/studio-child, and I added both independently to my wp-content/themes folder.

Studio 1.2.6, has studio/themes/studio-child but no themes/studio.

How should I update Studio in my wp-content folder?

Do I add the studio to wp-content … and then delete my present wp-content/studio-child?

Or do I pull the studio-child out of the studio/themes and add it to wp-content?