Cannot get Aperture to work after updating OS to 10.11.3

What version of Aperture do you have installed?

Aperture 3.6 works perfectly fine for me on El Capitan 10.11.3.

You cannot update Aperture any longer using the updates tab of the App Store. You can only update by reinstalling from your purchased history. If your Aperture version is not registered with the AppStore, because you bought it on a DVD or downloaded the Trial, you can only update to Aperture 3.6 with the help of the App Store Support, see this user tip:

Updating to Aperture 3.6 After the Release of Photos

Please search the forums before posting. This question gets asked and answered almost every day.

If the search engine for the forums were better, you'd have a point, Lanny, but as it is now, it is easier to ask a question than to continue searching.

And the user tip section is completely hidden. Nobody will come across the related user tips, unless the know, that we have to happen /content to the URL of the Aperture forum.

I'm glad, if someone is asking instead of turning away in disgust, when the search does not turn up anything.

In most cases, you don't even need to use the search function, just scrolling down the page will suffice:

Try the ASC main entry page, Lanny. If you do not enter ASC using a backdoor, you will be forced to start a search, never find anything, and then directly be catapulted into posting a question:

There are so few questions about Aperture recently, why send them away? Usually we are busy with relocating iPhone questions, or AppleID questions to there respective forums. 😁

Not really seeing that as an issue:

I guess it relates to how one asks the question.

The issue is, that we are compelled into submitting a question if the first attempt to ask did not result in a suitable answer to he first way you entered your question. We are not even encouraged to rephrase the question. I tested with the question in the title of the discussion. And the forum software encouraged me to submit the question. This is the way the software is working since the update last year, unfortunately.