You can’t run this script directly, it can only be used in a Smart Rule.
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In Finder’s downloads folder:
- Double click to unzip it
- Double click the Smart Rule to install it
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In DEVONthink:
- Find the Smart Rule in the Navigation Sidebar
- Contextual menu > Edit
- Set the search scope
- Click “Edit script”
- Remove the original script
- Paste the modified script from here
Using a Smart Rule
There are several ways to actually run a Smart Rule. From help:
There are two commands in the Tools menu related to smart rules:
Tools > Apply Rules: This runs the actions of a chosen rule on selected items, but only ones matched by the smart rule.
Tools > Perform Rules: This performs the chosen rule as defined, not acting on the selection.
In case of this specific Smart Rule you could simply use the Smart Rule’s contextual menu to run it.
As mentioned in Bluefrog’s post it’s a good idea to first test the result with duplicates.