Thread:ThePokegeek5000/@comment-4784321-20190520142218/@comment-4784321-20190521225851

You will not be able to load PortableCSSPad on the Theme Designer page.

I advice to create a new wiki, copy/paste the existing CSS/JS, change the theme designer to your liking over that wiki, then go to any other wiki page to use PortableCSSPad.