Search for projects like doc88-downloader on GitHub. These are "exclusive" in the sense that they require a bit of technical knowledge to run.
Downloading documents from Doc88 often requires credits or a login. However, several "exclusive" open-source methods and third-party tools allow users to bypass these restrictions by capturing the document pages as high-quality images and reconstructing them into a PDF. doc88 downloader exclusive
I can then point you toward the exact script or tool that fits your technical comfort level. Search for projects like doc88-downloader on GitHub
"Exclusive" downloaders typically bypass these barriers using one of three primary methods: apankowski/doc88-downloader: POC: download ... - GitHub doc88 downloader exclusive