I recently upgraded my Mac to Catalina 10.15.6.

I also upgraded emacs to 27.1. When I try to start it, I get an error:

that is cannot check for malicious software

I tried downloading the dmg directly from emacsformacosx.com and installing via brew cask install emacs, which appeared to get it from the same place.

brew install emacs installed 26.3 and would only open it in the terminal, not as a separate app. I know that there used to be a --with-cocoa option, but I could not figure out how to get that to work.

What do I need to do to install emacs on Catalina, such that it works in a separate window rather than in a terminal?


Posting what worked for me from here

brew cask reinstall emacs --no-quarantine

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