If you can find and restore old copies of the preferences and the Library data, it’ll be like nothing happened.
~/Library/Preferences/com.blacktree.Quicksilver.plist~/Library/Application Support/QuicksilverYou’ll want to restart Quicksilver, and if it doesn’t pick up the preferences right away, you might need to run defaults read com.blacktree.Quicksilver in Terminal.
Oh, you’ll also need to re-authorize all the stuff in your Privacy settings, like Accessibility, Full Disk Access, etc.
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Rob McBroom