Upgrading a pre-7.1 skin
You can upgrade a pre-7.1 skin.
When you open a pre-7.1 skin, mixins, formerly known as style presets, are automatically placed in the correct category. For example, a style preset containing only text styles displays in the Typography category, while a style preset containing text and background styles displays in the Combinations category.
Default styles in pre-7.1 skins are set to editable on upgrade.