By popular request we have released versions of NarrowbandNormalization for Mac, Windows and Linux on PixInsight 1.8.9-1. These are available for download from the same repository address as the 1.8.9-2 versions, ie https://www.cosmicphotons.com/pi-modules/narrowbandnormalization/
Enjoy and Clear Skies!
Mike
Enjoy and Clear Skies!
Mike