There is no single "official" downloader provided by Pixiv. Instead, the community has developed a variety of tools to suit different user needs and technical skill levels.
“If I can’t keep it, did I ever really have it?” Pixiv Fanbox Downloader
has become a sanctuary for digital creators. From high-resolution concept art and illustrated comics to PSD files and uncensored works, it allows fans to directly fund their favorite artists. However, a recurring technical problem plagues both creators and consumers: How do you efficiently download and back up your purchased content? There is no single "official" downloader provided by Pixiv
There is no clean moral resolution. The downloader is simultaneously: Pixiv Fanbox Downloader