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The current macOS (1.015, Catalina) has additional security checks.
The installer gives a warning for the current gretl-2019d-quartz.pkg distribution.
Apple warns that the program cannot be run. There is however a button to open the file so
it can be opened (at your own risk).
But it is not safe to assume that this will continue to be the case.
See this page:
https://support.apple.com/en-gb/guide/security/welcome/1/web
As of February 2020 Apple will require that apps distributed outside of the Mac store will
have to be notarized.
See
https://appleinsider.com/articles/19/12/23/apple-will-enforce-app-notariz...
which most likely means that the current gretl package can't be opened and that gretl
cannot be run on macOS Catalina.
Another remark: I do not know how the macOS package is created but the contents cannot be
inspected by Pacifist (an app used to view the contents of a ,pkg distribution; see
https://charlessoft.com). Very useful app.
regards,
Berend Hasselman