This program isn't for the technophobes. It's a CLI - Command Line Interface tool. And the guy who made it is *eventually* gonna make a GUI but that's still a ways off.
- What I need is for it to catalog my 3000 ish titles and then download them all to an external HDD as the primary backup before R18 closes.
There is a way for that, but i'd recommend supporting the dude on patreon and hopping in the discord to ask. This is possible, but batch downloading isn't a part of the free version.
Using the paid version you can achieve this.