![]() Next, download a new installer from your source and install it on your computer. Empty the Trash to ensure that everything is deleted. To make sure that the app was installed correctly and the installer was not corrupted, uninstall the app by dragging the icon from the Application folder to the Trash. If the problem doesn’t go away after doing all of the above, then it’s time to consider the solutions we’ve listed here: Fix #1: Reinstall the App. If you have insufficient disk space, your apps won’t function properly. Make sure your Mac has enough storage space.If it runs properly on another device, then the fault is on your device. Download the same application on another Mac to make sure that there is no problem with the installer and the app itself.Clean up your device using a Mac cleaner to delete junk files that might be getting in the way of the running of your applications.Sometimes all your Mac needs is a fresh restart to resolve minor bugs and glitches. If you’re getting this error when opening a newly-installed application, here’s some checklist you need to go through first before trying the fixes below: What To Do About OSStatus Error 99999 on Mac If Gatekeeper is corrupted, then it would have problems verifying your installation and come up with this error. This verification process prevents you from accidentally or unknowingly executing malware. Also known as the Gatekeeper, this security feature enforces the code signing and checks the downloaded applications before authorizing them to run. ![]() In some cases, the error appears due to a corrupted SystemPolicy file. If this is disabled, you will most likely encounter this error.īut if third-party installation is allowed on your Mac or the app you installed is from the Mac App Store, yet you encountered this error, then the cause is something else. You need to enable this in System Preferences. If you’re downloading the app from a third-party source, you need to make sure that your Mac allows non-App Store applications to be installed in it. Some users have encountered it in Sierra, High Sierra, Mojave, and even Catalina. There is also no specific version affected by this error, which means that it can occur regardless of the macOS version your device is running on. The apps install just fine, but when you try to launch it, the app won’t open and you get this error message instead: Now, the problem does not lie with the installation process itself. But what if the app you want to install is not available there? Plus, there have also been reports of the OSStatus error 99999 appearing even when the app installed was from the Mac App Store. We all know that this is impossible so this error could be Apple’s way of forcing you to use the Mac App Store. This is probably due to Apple’s increasing campaign of keeping everything within the Apple system - Apple’s hardware needs to run only Apple software only. About Outbyte, uninstall instructions, EULA, Privacy Policy. Even if you have enabled installing from a third-party source under System Preferences, there are still instances of this error message appearing and causing the app not to open. The OSStatus error 99999 usually happens after you install an app from a third-party source, regardless of whether it is an official or fake source. This error doesn’t occur much often, but when it does, you’d be left scratching your head for answers because this can be quite tricky to handle. One of the not-so-common errors encountered during app installation is the OSStatus error 99999. But it doesn’t mean that it is flawless all the time. Installing an app on macOS is a lot less complicated compared to other operating systems. But if you’re installing from a third-party source, you need to enable this function in System Preferences. If you’re installing from the Mac App Store, you can directly install the app without doing anything else. When you want to install an app on your Mac, you have two options: you can either download the DMG file from the Mac App Store and install it by dragging it to the Applications folder or you can download the installer from a trusted source and install it on your Mac.
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