ARTist works on Android 8.0 Oreo now.
We had to disable the feature “Untouched base.apk” to get it working.
/data/apps/<application-name>/base.apk with the merged & resigned apk it works.
This must get resolved in a separate issue, if possible.
If you want to run ARTistGui on Oreo, activate the switch Replace base.apk in the settings. This also works on device with Android 7.1 and lower, just in case you want to use it there.