Patreon posts to ePub

I've been using the WebToePub extension of Firefox to package Patreon posts from creators I subscribe to to ePubs to read later, however today it seems it stopped working with an error

Could not find content element for web page 'https://www.patreon.com/posts/chapter-418-end-100268775'. fetchWebPageContent/<@moz-extension://c4e285c5-ca5e-4a44-b891-6030850e9839/js/Parser.js:501:23

Anyone have a suggestion for an alternative ePub creator for this? Or a way to get WebToePub to work for Patreon again?