Welcome back to the Community, @cv2019!
Can you clarify what’s the total size of the files you’re trying to download from Dropbox?
Also, from what I get, you’re trying to download them via the Dropbox website. Is this right? If yes, then keep in mind there’s currently a downloading limit of 250GB there, so if your files/folders are more than that, you’ll need to download them in batches.
Even then though, I can’t guarantee that your web browser won't time out at some point.
However, if you happen to have the desktop app installed, you should be able to simply copy your files from the local Dropbox folder to the location of your choice directly.
Hope this helps.