New RT User. Can't open because it is an unidentified Developer

Hi, I’m new to RT, and not an expert computer user. I just downloaded the software, but it says “Can’t open because it is an unidentified Developer.”
I got some instruction somewhere that says Press Command+Space.
However, when I did that, Mac Siri pops out.
Can I use some help here from some kind souls?
Many Thanks,
Aaron

This is a security measure used by Apple these days. The way to get around it is:

To override your security settings and open the app anyway:

  • In the Finder, locate the app you want to open.

    Don’t use Launchpad to do this. Launchpad doesn’t allow you to access the shortcut menu.

  • Control-click the app icon, then choose Open from the shortcut menu.

  • Click Open.

    The app is saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app.

Note: You can also grant an exception for a blocked app by clicking the “Open Anyway” button in the General pane of Security & Privacy preferences. This button is available for about an hour after you try to open the app.

To open this pane, choose Apple menu > System Preferences, click Security & Privacy, then click General.

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Thank you. It worked! Now, it’s time to learn how to use it:)

Thank you @patdavid, info added to http://rawtherapee.com/downloads to the macOS 10.9/10/11/12 section.

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