Sure. Control-click on the installer icon, and choose "Open" from the contextual submenu. You will see a button in the resulting dialog that allows you to override Gatekeeper.
Walter
> On Jan 4, 2017, at 9:43 AM, Cai Gengyang <gengyangcai@gmail.com> wrote:
>
> So I am trying to download Ruby from this site --- http://railsinstaller.org/en.
>
> Managed to download Mac OSX 10.7 and 10.8 , but when I tried to open it, this is the message I got :
>
> "RailsInstaller-1.0.4-osx-10.7" 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.
>
> Safari downloaded this file today at 10:34 pm
>
> Any idea how to fix this ?
>
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