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This is what I did to get it working.

1. Save the script to ~/Library/Application Scripts/com.omnigroup.OmniOutliner4. This makes the script available in the customize toolbar dialog.

2. In OO4, customize the toolbar and drag the script to the toolbar.

3.When you want to convert an outline to Keynote, click the script icon and follow instructions.

This solutions works better than the export to keynote function in OO3 because the output file will be in the latest Keynote format.