Indigo and macOS Catalina
Written Friday 14 Feb
Indigo is now notarised by Apple, which means Indigo now installs on macOS Catalina without giving a "can't be opened because Apple cannot check it for malicious software" error.
You can download the new notarised version (4.2.27) on the download page.
The latest beta in the 4.4 Indigo series has also been notarised and is available on the forum.