The BatchChannelExtraction script included in the PixInsight 1.8.6 distribution is the latest version 1.2.3 of the script, with modifications by Michael Covington and Thomas Stibor in 2017. In the PixInsight 1.8.5 distribution, an older version of the same script was also included by mistake, hence the duplicate entry in the Script menu. This is now fixed. I don't understand why you say we have a 'corrupt version' now. Can you please describe the issues with this script?