Mac cannot install application cause of security problems

Asked By 0 points N/A Posted on -

Hi there,

I can’t open and install anything downloaded from another source than Mac App Store. Not anything I want and I need can be found on App Store. Is there a way to change these settings ? What can I do ?

Thanks !

“” can’t be opened because it is from an unidentified developer.

“etax2013_1.aoo” is on the disk image

“etax2013_1.dmg” . Safari downloaded this disk

Image today at 12:30 pm from

Answered By 590495 points N/A #180308

Mac cannot install application cause of security problems


This happens because it is default to Mac OS X to not allow installation of unsigned apps. I guess they do this to maintain the security of the system so you cannot install just any applications that may not be familiar to you and so the operating system will not be exploited. But this is only a precautionary measure for the operating system and can be deactivated so you can install unsigned applications.

But before you proceed on installing unauthorized apps that don’t come from the Mac App Store, you should be aware of the consequence and do it at your own risk. To install unsigned applications in Mac OS X, click on the Apple menu then select System Preferences. On the next screen, click Security & Privacy. Click on the Lock icon to make changes to the system.

When you are prompted, enter your administrator username and password. In General tab under “Allow applications downloaded from” section, select Anywhere then click Allow From Anywhere in the prompt that will appear. After this, run and install the app. After the installation, go back to Security & Privacy then select “Mac App Store and identified developers” in “Allow applications downloaded from”.

To better understand it, visit Cannot Open .mpkg on Mac.

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