To downgrade OpenSSH on a Mac, you must uninstall the current version of OpenSSH. You can do this by running the following command in a terminal:
sudo launchctl stop com.openssh.sshd sudo launchctl unload -w /System/Library/LaunchDaemons/ssh.plist
Next, you will need to download the older version of OpenSSH that you want to install. You can do this by finding the version you want on the OpenSSH website or by using a package manager like Homebrew to search for the version you want.
Once you have downloaded the older version of OpenSSH, you can install it by running the following commands in a terminal. Let’s assume we will install openssh8.6p1.
wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.6p1.tar.gz tar xvzf openssh-8.6p1.tar.gz cd openssh-8.6p1 ./configure make sudo make install
Replace <8.6p1> with the version number of the OpenSSH release that you downloaded. This will install the older version of OpenSSH on your Mac.
Once the installation is complete, you can check the version of OpenSSH that is installed by running the following command:
This should print the version of OpenSSH that is installed on your system.
Note that downgrading software can sometimes cause problems, so it’s generally a good idea to back up your system before attempting to downgrade any software.
I hope this helps! Let me know if you have any other questions.