Step-by-step instruction to fully uninstall all Pegasus related software from a Macintosh

  • Last Post 24 August 2018
Bert Trumble posted this 08 February 2018

Please provide a list of instructions of how and where to delete all Pegasus related files (Drivers, extensions, utilties, etc.) from a Macintosh.

I do not want to have any software from Promise/Pegasus on my machine using memory, CPU cycles, etc.


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R P posted this 08 February 2018

Hi Bert,

First, only running software consumes memory/CPU/etc, non-running sofware puts no load on your machine. If you don't start the Promise Utility it will not consume any resources, if you don't attach a Pegasus, the driver will not be loaded. If that is your primary concern you need do nothing else.

That being said, to delete the Promise Utility just open finder, go to Applications, find the promise Utility and drag it into the trash. You'll probably need the admin password for this.

Deleting the driver is similar, the bundle name is probably PromiseSTEX.kext (kext is for Kernel Extenstion, aka the driver). In my High Sierra install I find the bundle in /Library/Extensions, in older macOS versions it might be in /System/Library/Extensions. Just open the filer, go to the appropriate folder, find the kext and drag it into the trash. You will probably need an admin password for this as well.

Steven Sroba posted this 23 August 2018

Is there a chance that you could make an uninstaller for the installers (driver and utility)? It took me some time to hunt down all of the remnants of your Utility installer. It's nice for creative types to not be their own IT department.. or to need to put in a ticket for them to figure this stuff out (or Google it).

I did notice that, although I have no Promise software open, there is still something called "promise" running in memory (first image).

Next, I deleted the Promise utility as this directed, but there is still a lot of files left over which deleting the App does not remove (next image).

Lastly, I took a peek in the Promise Util installer. There are quite a few things which remain. Any installer which installs to this level should really include an uninstaller. It could be a script, a readme, a KB article. Some kind of breadcrumb other than sifting through the installer.



Richard Oettinger posted this 23 August 2018

Hey Steven,

I use AppCleaner to remove any unwanted apps and their relics...

Steven Sroba posted this 24 August 2018

Thank Richard. I expect for the vendor to provide removal options for their products. If their installer puts software in, they need to help to take it out.



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