Mac OS Sierra: Open Apps From Unidentified Developers
У вашего броузера проблема в совместимости с HTML5
tutorial on how you can change your mac os sierra settings to allow you to open apps from all developers. if you are watching this you have likely ran into "App can’t be opened because it is from an unidentified developer" while installing a new program. this tutorial will teach you how to get around this and let you install any app from any developer
Paste into terminal: sudo spctl --master-disable
(paste, hit enter, then enter password and hit enter again)