LeanCreator:

- Unzip archive

- Try double-click, security error

- Go to Privacy & Security and click "Open anyway"

- Try double-click again, it opens fine.

ObreonSystem:

- Open DMG and copy all the files to a folder

- Try double-click, program opens fine but errors because missing files.

- Uses instructions given in README, running with './ObreonSystem', and program opens without errors.

macOS 26.0.1

> "Go to Privacy & Security and click "Open anyway"

Thanks. Unfortunately this no longer works on sequoia; you first have to run "spctl --global-disable" in a terminal and then - within a few seconds - go to Privacy & Security and select the new option in the popup menu (which was not available before). See also https://news.ycombinator.com/item?id=41184553. That's what I meant by "tricks". And even though there are apps which still didn't work. But fortunately I still have a Mac with an older OS version which I'm not going to upgrade.