I think our hiding of plenty of useful options under --list=hidden-options is too obscure. I think we should unhide them all, printing the full options list on --help. We're being inconsistent with other projects, including hashcat, by not printing the full options list even on explicit --help. This can be confusing to new users, who wouldn't realize there are more options nor how to see tho

Currently, if the script breaks, I have to restart downloading from the beginning of a course. I would love to be able to resume from where it broke.

Perhaps it could skip existing files, even if I have to manually confirm Y/N for overwriting existing files?