As of Catalina Gatekeeper will not allow you to run an unsigned downloaded binary package or downloaded old-style ELF binary and it's only possible to disable that check with the terminal.
Signed software is checked online with Apple's OSCP server but this seems completely unnecessary if there's also an XProtect check which is regularly updated and Apple can feed it a rescinded certificate (see recent HP printer driver story).
Biting the hand that feeds IT
