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Thanks! That solved it. Not accomplishing what I had originally asked but rather enabling what I really needed which was the downloads functioning and installing correctly.

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I will give that a try. Thanks Dazmondo 77. Also others who tried telling me this and I did not grasp what was being said.

markw: Me either. It was working fine until some months ago following a security update.

I suspect I am on the path to resolving this. The advice changed my original goal of shutting it off to getting the update download fixed, thanks to everyone.

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Thanks, I'll try that. I do want and need any update that will run on my OS. I'd just like to lessen wasting time on any that don't. Which is so far limited to the Affinity updates.

As mentioned the Affinity apps themselves are all running just fine without their updates so no argument at all about them being supported for Mojave. 

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I assume that they will work for Catalina too but I get a message that my OS, Mojave, is no longer supported every time they finish downloading. Until sometime well after Catalina came out all updates downloaded and installed just fine for me.

I assume if I had Catalina they would download fine.

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Affinity software runs fine and has since I installed them a long time ago. It is the updates I am curious about opting out of as when the process completes it ends with an error message my OS is no longer supported.. I'd like to find a way of stopping the waste of time provoked by the nonfunctional updates. At least until after I am using an OS they do work with.

Affinity Photo and Affinity Publisher both are working fine on Mojave without them.

By comparison, it was really easy to turn off the notifications to update to Catalina and then to Big Sur. The suggestion is still there to do so but not any in-my-face imperative for it. 

I'm hoping Affinity also has such an option as I'm not wanting to shut off the other updates that will install with no problem.

 

As for the question what and from where. These are Affinity's updates for Big Sur from the App Store.

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Is there a way to stop updates from showing up? What is being offered is for the newest OS and will no longer download on my system. At some point I will certainly update to Big Sur but for now I am required to be running Mojave due to the peripherals and software required by my employer no longer being supported. The only way I can get rid of the notifications appears to be trying to let them download and getting an error message they are not compatible. And regularly repeating this.  Or do I need to stop using this software to resolve this (I have a paid version of two pieces of Affinity software.)