To easily download the file, open the article you're reading in Safari.Make sure, that everything is now installed in /opt/ (arm64), Start a Rosetta Terminal to deinstall everything from /usr/ and start an arm64 Terminal to delete everything from /opt/ If you find packages like Ruby in /usr/ (Intel), but brew and openssl in /opt/ (arm64), then reinstall it using the Terminal you installed it with. Make sure to NOT start the Terminal using Rosetta. This guide has been tested with an arm64 Terminal. That means, if you install homebrew via a Rosetta Terminal, and then openssl/Ruby using an arm64 Terminal, then you need to completely uninstall everything, and start over. It's very important, that you make sure, that the whole dependency chain has been installed using the same Terminal.

The only way to install older Ruby versions now, is to patch OpenSSL locally.

Later versions of OpenSSL are not compatible. The problem with installing older Ruby versions, is that OpenSSL, a dependency of older Ruby versions, is 'end of life' and not shipped using brew anymore.

Download ruby for macos