It should work on any rom by following this logic:
Builds (starting with r18 up to r20) are Android 5.0 Lollipop only.
Builds (starting with r21) are only for Lollipop 5.1.
Builds (starting with r23) are for Marshmallow 6.0.1.
Builds (starting with r23) are also compatible with Android 7.0 Nougat and Android 7.1 Nougat .
Flash the latest release in your recovery:
1 - Flash the bloody zip on your recovery
Official app support:
Google+ FK community
Disclaimer to moderators:
Slight OT is fine, but when users decide to act stupid they should be dealt with with the appropriate means - its really annoying for me when OT turns crazy. Please put the warning/ban hammer anytime any of you think there's lack of respect and/or too much unwanted OT crap - but if it doesn't meet this criteria let the OT posts alone. Thank you.