if you have OS X El Capitan 10.11 or a more recent version: you can use the version which installs Datashare with Docker; it is a more powerful version.
Standard (High Sierra and more recent versions)
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Let's first install Homebrew, which is needed for installing Tesseract OCR. You can find Homebrew's instructions here or follow the next steps. Open your Finder:
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Search for 'Terminal' in your applications and double click on 'Terminal.app' to open it:
Go to this page: datashare.icij.org, scroll down and click 'Download for free'.
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Go to your 'Downloads' and double-click 'DatashareStandalone.pkg':
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You might see this window which says '"DatashareStandalone.pkg” can’t be opened because it was not downloaded from the App Store.' Click 'OK'.
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Go to your Mac's System Preferences:
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Open 'Security & Privacy':
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Click 'Open Anyway':
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Click 'Open':
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Click 'Continue', 'Install', enter your password and 'Close':
The installation begins. You see a progress bar. It stays a long time on "Running package scripts" because it is installing Tesseract OCR, Java Runtime Environment, Datashare backend and Datashare frontend.
You can see what it actually does by typing command+L, it will open a window which logs every action made.