Here's the situation:
Instructions on how to run applications that 'can't be opened because it is from an unidentified developer' in Mac OS X Mountain Lion. Stop app mac os x. LOWEST PRICE EVER: AirPods 2 - $99.99 NEWS. Mac App Store and identified developers; Anywhere. Just the Mac App Store. The safest option to choose here would be the “Mac App Store,” since Apple reviews all apps that are accepted in their store and can remove them quickly if necessary. Basically, you’ll know that your Mac will be as free as possible from malware if you use this. While the Mac is a little more open than iOS - the only way to get third party apps onto your iPhone and iPad is to download them from the iOS App Store - there are still a lot of hoops to jump.
I have Mac OS X 10.10.1
I have the Gatekeeper set to only open applications from the App Store and from identified developers.
Preview is my default application for opening pdf-files.
I have downloaded some pdf's which I want to open in another app, (PDFpen, Safari, ..)
(By double clicking on these files they open in Preview without any problems).
I then select the files and use the Finders Show Inspector (or Get Info)-command to change the 'Open with'-app to PDFpen (or Safari or..)
When I then double click on one of the pdf-files I get a warning message: 'filename.pdf' can't be opened because it is from an unidentified developer. (See attached image).
I then right-click on the file and choose Open With (PDFpen, Safari, ..), and get a new warning message, but now with an option to open the file, which I then do.
After opening the file just once, there is no more problems, I can open the file by double clicking, and it opens in the app I have chosen for that file. BUT this only applies to that particular file. Each separate pdf-file requires the same procedure..
How To Open Apps On Mac From Unidentified Developer
I have seen the same problem on 3 different mac's running Yosemite.
How To Open Apps From Unidentified Developer Mac Yosemite National ParkHow To Open Apps From Unidentified Developer Mac Yosemite Mac
If I export a Pages- or Numbers-document, the created pdf-file behaves in the save manner, but a pdf created by export from MS Word (ver 14.2.5) can be opened in any desired application by double-clicking.
iMac (27-inch Late 2009), OS X Yosemite (10.10.1)
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Background:
By default, Mac OS 10.8.x , 10.9.x , 10.10.x , 10.11.x and macOS only allows users to install or run applications from 'verified sources'. Sometimes, when a known developer (such as Microsoft or PowerSchool) needs to update their application's code to cofirm their 'identity' with Apple, an error may occur. As a result, users may be unable to install or run some applications downloaded from the internet or stored on physical media, and the error below is displayed:
How To Open An App From An Unidentified Developer Mac
In the meantime, Users can follow the directions below to prevent this error message from appearing
How To Open Apps From An Unidentified Developer MacDirections:
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