Skins and Themes can be installed over an existing build.
Install Skin Helper Service from my repo (located in Context Menus). Install ExtendedInfo Script from my repo (located in Program add-ons). Install Aeon MQ 8 for Matrix from my repo (located in Look and Feel > Skin). When you access Skin Settings, Kodi will prompt you to install the Skin Helper Service Colorpicker add-on. While you are in Skin Settings, scroll down to Add-ons. This will show the installation status of additional add-ons that MQ 8 uses. Select "Install All Add-ons Now (Selective Mode)" and you can choose one at a time which add-ons you would like to install.