High Sierra won't let me open app from unidentified developer despite gatekeeper settings
I'm attempting to open a file I downloaded online. The problem most people had at the release of Sierra has returned, with an error message complaining that it's from an unidentified developer. I have the security settings in system preferences set to anywhere and I've run the terminal command to disable "spctl" and it still won't open. Does anyone have any idea what I've done wrong?
MacBook, macOS High Sierra (10.13)