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Drag the application from the backup to the Applications folder, or just download a fresh copy from the Omni website (thus guaranteeing the latest version). You'll also want your license file, which lives in /Library/Application Support/Omni Group/Software Licenses. After you've got your backup mounted, start OmniOutliner, go to OmniOutliner->Licenses, click on the Add License... button, then the Import License File... button and navigate to that file in your backup and click Open.