Welcome DeviantARTists! Republishing this again due to popular demand. Keep in mind that Apophysis has been updated several times over the past 6 years, some of this may not be applicable to new versions, especially the rendering specs. Happy exploring!
To download the script that is mentioned in the tutorial, click AddRepetitionSymm
Also of note, I’ve since published a more in-depth Apophysis Tutorial for Beginners which includes a printable cheat sheet. You should definitely check it out.