Extracting LRPLUGIN files with The Unarchiver
The macOS Archive Utility can damage LRPLUGIN files during extraction. This prevents the plug-in from working in Adobe Lightroom. Use The Unarchiver as an alternative.
How it works
The Unarchiver supports LRPLUGIN files and extracts them without data loss. The files are then ready for use in Adobe Lightroom. The program is available for macOS and processes archive formats precisely.