I've been getting occasional notifications about Numbers having an Update available. I mistakenly opened a spreadsheet created in the old, non-crippled version, and decided to just let it stay "revised".
In order to get rid of/stop the nagging, I opened the App store and clicked on Update even though it indicated there were none available. Failing to see Numbers that way, I used the Search function and found, indeed, version 4.0.5 with a handy "Update" button. Clicked the Update button and enjoyed watching the spinning gear... for about 10 minutes. After that, I decided to quit Numbers thinking the App Store might not want it running during an update (contrary to every other experience I've ever had with it before! Hey, it's a "new" Apple! Things are changing!
). I actually took a break, even a nap, and returned to see that there was no update downloaded nor in-progress. Clicking the Update button restarted the spinning gear.
[insert twiddling thumbs smiley here]
After another experience with boredom, I decided to seek word from the Apple "Support" Forums. They were nice enough to have my exact question already answered!
The answer was actually staring at me on the App Store page, in the tiny, non-enlargable, not quite black, but ever so modern looking text: "Numbers 4.0.4 requires mac OS 12"
Apparently things at Apple have changed so much that it now cannot even tell what version of their OS we might be running! "Stupid is as stupid does."
I bet this doesn't happen on iOS!