I'm trying to download adobe indesign but i'm getting a message that's saying "Install.app" can't be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified devel

I recently purchased adobe indesign I'm trying to download it but i'm getting a message that's saying “Install.app” can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.

System Preferences / Security & Privacy / General tab.
Change the settings at the bottom half of the window.

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