• Theme works best with custom 7.1.x/ 8.x ROMs with OMS support
• Theme also works with Google stock 7.1.x/8.x ROMs (note that stock ROMs have some theming limitation)
• OxygenOS and LineageOS aren't fully supported (use at your own risk)
• You need substratum app from the Play Store to apply the theme
• You need to be rooted
When you open the theme in substratum app you'll see the drop down menu on top of the overlays. You need to choose one depending of your ROM Android version. There are also some overlays with different variant for specific Android version.
AOSP apps like Clock, Messaging, Gallery, Contacts and Dialer may or may not work on Nougat ROMs, because every custom ROM has their own variant of those apps, so if you get an error while compiling, just don't install them.
System, main Google's and third party apps