I have searched multiple threads on and here as well as across the wider internet and have not found any way to automate downloading the contents of shared folders that are greater than 20GB in total size.

There have been several lengthy threads on the community forums bemoaning the fact that people and their clients can't use the server for what it is sold for. This limit is because they zip the files before users download in bulk, it's not a restriction aimed at preventing users from downloading the files. Even worse you can't download any folder with a total size >20GB in one go (or any folder containing more than 10,000 files). While they have increased from the original 1GB/file it's still impossible to have files larger than 50GB with.

It turns out that Dropbox have hidden away some arbitrary limitations (for reasons kept to themselves). If you try and download the contents that have been shared with you from a Pro account you receive an error such as The zip file is too large, or the folder is too large to download.

However, it seems Dropbox has caught out plenty of paying customers. With any other cloud storage service I could simply download the whole folder at once or use something like rclone to download the items at my own pace.

I have had a folder shared with me containing a few TB of files, about 1GB each.

Dropbox file downloader