Question: open app from unidentified developer -- Apple instructions not working
Hi. I'm running MacOS Sierra 10.12.6. I'm trying to open an app from an unidentified developer (Art of Illusion). I found the these instructions from Apple for overriding the "app from unidentified developer" error: macOS Sierra: Open an app from an unidentified developer. Basically it says to right-click the app file in Finder, choose "Open" from the shortcut menu, then click "Open." This is supposed to grant the app an exception. However, when I right-click and choose Open from the shortcut menu, the only choices I get are "Cancel" and "Move App to Trash." (The article also says an "Open Anyway” button will appear in the General pane of Security & Privacy preferences for about an hour after you try to open the app, but I'm not seeing that either.)
Any ideas on how I can open this application? Thanks.
MacBook Air (11-inch Mid 2013), macOS Sierra (10.12.6)