Please find below the steps on how to reinstall Aura Antivirus on your Mac device.
1) Run the uninstaller Package. 
2) Click on open on the next screen. 
3) The package is now uninstalled. 
4) To Reinstall Aura Antivirus, please do so by signing in using this link with your Hotspot Shield Premium Credentials. From there you can re-download the add-on from your account page.