There is no guide because someone has to be willing to spend time to make it and then update it with newer versions. But the process is, you have to go to Inspect element's Network tab, reload the page that has the image/video you want, search for license to get the license URL, search for .mpd file, download it, open it by notepad and get your PSSH. Copy cookies from the header, and then put all (license URL, PSSH, cookies) in a Widevine decrypter like CDRM-Project (now RIP) to generate your account's unique keys. Once you have your keys, that's your key to download all videos and images accessible to you in Passes. For each image/video you just put the .mpd link and your keys into a downloader like N_m3u8DL-RE and download them easily. For videos, the sound and video files get downloaded separately so you have to then merge them by ffmpeg. If you stay vague and don't specifically mention website's name, AI chatbots like Gemini can walk you through it.