Uninstall Native Instruments products from Mac OSX (based on https://support.native-instruments.com/hc/en-us/articles/210291865-How-to-Uninstall-Native-Instruments-Software-from-a-Mac-Computer)

ni-uninstaller.py

#!/usr/bin/env python
from __future__ import print_function

import argparse
import os
import shutil
import sys

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Native Instruments uninstaller util for Mac (see: https://support.native-instruments.com/hc/en-us/articles/210291865-How-to-Uninstall-Native-Instruments-Software-from-a-Mac-Computer)")
    parser.add_argument("name", type=str, help="Name of the application to be uninstalled (ex: Session Horns)")
    parser.add_argument("-f", "--force", action="store_true", help="do not ask for confirmation ")
    args = parser.parse_args()

    paths_to_search = {
        # Application Files
        os.path.join(os.sep, "Applications", "Native Instruments"): args.name,
        os.path.join(os.sep, "Library", "Preferences"): "com.native-instruments.%s.plist" % args.name,
        # Plug-in Files
        os.path.join(os.sep, "Library", "Audio", "Plug-ins", "Components"): "%s.component" % args.name,
        os.path.join(os.sep, "Library", "Audio", "Plug-ins", "VST"): "%s.vst" % args.name,
        os.path.join(os.sep, "Library", "Application Support", "Digidesign", "Plug-ins"): "%s.dpm" % args.name,
        os.path.join(os.sep, "Library", "Application Support", "Avid", "Audio", "Plug-ins"): "%s.aaxplugin" % args.name,
        # App-specific Data and Support Files
        os.path.join(os.sep, "Library", "Application Support", "Native Instruments"): args.name,
        os.path.join(os.sep, "Library", "Application Support", "Native Instruments", "Service Center"): "%s.xml" % args.name,
        # Preferences Files (User Library)
        os.path.join(os.path.expanduser("~"), "Library", "Preferences"): "com.native-instruments.%s.plist" % args.name,
        os.path.join(os.path.expanduser("~"), "Library", "Application Support", "Native Instruments"): args.name,
        # Content Files
        os.path.join(os.sep, "Users", "Shared"): "%s Library" % args.name
    }

    paths_found = []    
    for path, search in paths_to_search.items():
        files = [x.lower() for x in os.listdir(path)]
        if search.lower() in files:
            paths_found.append(os.path.join(path, search))

    if len(paths_found) == 0:
        print("%s wasn't found in any path known by the uninstaller." % args.name, file=sys.stderr)
        sys.exit(1)
    
    print("Found references to %s in the following paths: \n" % args.name)
    for p in paths_found:
        print("- %s" % p)

    if not args.force:
        read_input = None
        if sys.version_info.major < 3:
            read_input = raw_input
        else:
            read_input = input

        assert callable(read_input)

        print("\nWARNING: make sure %s is not open (when in doubt, close any DAW you may have running or Kontakt instances" % args.name)
        print("\nAre you sure you want to completely remove them? [y/N]")
        while True:
            choice = read_input().lower()
            if choice in ("y", "Y", "yes", "YES"):
                break
            elif choice in ("n", "N", "no", "NO"):
                print("Uninstalling %s cancelled" % args.name, file=sys.stderr)
                sys.exit(1)
            else:
                print("Please respond with 'yes' or 'no'")

    for p in paths_found:
        if os.path.isdir(p):
            shutil.rmtree(p)    
        else:
            os.remove(p)
        print("Removed: %s" % p)

    print("%s uninstalled successfuly" % args.name)

To use this script, just download it, chmod +x ni-installer.py and run it with sudo