Unable to import after macOS security prompt

[radiovisual]

When I try to import this using the instructions on the Readme, I get the following error:

macOS Mojave 10.14
Terminal Version 2.9 (421)

[radiovisual]

Looking into this issue further, it seems that it might be a problem with macOS, because if I get this error first:

and then I go into System Preferences to "Open anyway":

then Terminal complains that the file is corrupt and can't be installed. However, if I do a direct Download of the file and save it into a new file, then there is no problem.

I just did this to get around the security warning:

$ curl https://raw.githubusercontent.com/sindresorhus/terminal-snazzy/master/Snazzy.terminal > Snazzy.terminal

and double-clicked on the curled copy of the Snazzy.terminal file and it worked. So I am not sure if the macOS security settings are somehow messing with the import?