Stop WordPress Mangling Your Code fix

I need someone who has used this work around before. Currently the website that supports the process is down!! Here’s the original link: https://lynnepope.net/stop-wordpress-mangling-code

I don’t remember what the process was though, and now I have a 2nd blog on my site that I want the visual editor to actually work on… but alas I can’t remember what I have to adjust to fix it!

If anyone has used this work around and knows how to remove it, please let me know… thanks!