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The eXtract Wizard has been discontinued since 2017. It won't work with any recent version of macOS. There are no plans to resurrect it either.

The only supported way to extract backup archives is Kickstart which is written in PHP. Kickstart has a web interface and a command line interface.

Since you are dead set against using the far easier of the two options (a local server, e.g. with MAMP) you will have to use the command line.

First, install HomeBrew using the instructions in https://brew.sh

After the installation is done, follow the instructions it shows you to add the HomeBrew CLI executable (brew) to your path.

Close the Terminal and open a new one.

Run brew install php to install the latest stable version of PHP (at the time of this writing it's 8.1).

At the end, follow the instructions on your screen to add PHP to your path — basically, run brew link php.

Close the Terminal.

Download Kickstart Core and extract it to a folder along with your backup archive. Let's say that you use your user account's Downloads folder.

Open a Terminal and run

cd ~/Downloads
mkdir extracted
php ./kickstart.php YOUR_BACKUP_ARCHIVE.jpa `pwd`/extracted

Now your files are extracted in the extracted folder inside your Downloads folder.

Again, I recommend using the web interface to Kickstart. If you were comfortable using the Terminal I don't think you'd be asking me how to extract the archive.

If you get stuck about setting up, configuring and optimising PHP on macOS I recommend reading my blog post Custom Apache and PHP server on macOS, the definitive 2019 edition. It's a bit old (I wrote it three years ago) but it's still working, of course with newer PHP versions.

It goes far more in depth than just installing PHP. It takes you by the hand to install multiple PHP versions, Apache and MySQL and have everything work together to create a custom, very efficient, local server for developing sites and web software. I've been using that instead of MAMP on my Mac — and yes, it works fine on Apple Silicon Macs as long as you replace /usr/local with /opt/homebrew due to the different installation root of the Apple Silicon version of HomeBrew :)