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Hello erwin177,
Thanks for the post in Apple Support Communities.
I understand you're unable to install an app downloaded from a website. Can you provide more detail about what happens when you try installing the app? If you get an error message, what does it say?
Which macOS version are you using? You can check by clicking Apple menu () > About This Mac.
This link is a great guide for installing apps on your Mac for reference: Install and uninstall apps from the Internet or disc on Mac. From your post, it sounds like one of the steps recommended in that link may be helpful if you're seeing an alert that the developer is unidentified. If that's the error you see, check out the details here: Open a Mac app from an unidentified developer.
I hope this helps get you started.
Cheers.
Jan 28, 2019 7:02 AM