Don't have a chance to look into this right now, but is anyone having issues on PHP 7.3? Saw a comment on the module listing from Alex Capes about it breaking. In the meantime, I've opened up an issue over at GitLab: https://gitlab.com/rockettpw/seo/jumplinks-one/issues/1
@Karinne Cyphers - only saw your note now, sorry about that! It's likely due to rules 16a/16b in htaccess. 16a limits the characters allowed in a URL, so hits would never even boot up ProcessWire. Try changing to 16b (and adding the tilde if it's not there).
Future Development / v2
I profusely apologise for how long it's taken to get things done for v2. As some of you know, my daily responsibilities have taken over, and committing time to open-source projects is not there as it once was. I'd love to be able to say that I can try find some time to get to it, but it's simply a promise I can't make or keep, unfortunately…
The way I see it, there are two options on the table. First is to wait it out (I know, I know…) – I do have a project board on the old repo, so I know what stands where and what I'd envisioned for the module, and can pick things up where I left off last (phew, haven't touched jQuery in forever – that might be a challenge), when the time avails itself. Technically, I'm about half way there but there's still quite a bit of work to do in terms of frontend. Second option would be for someone to take over the project. It'd definitely need to be someone who can commit the time to its development, and develop in line with the way in which the module has been built so far (there's a decent amount of SoC going on, and the module is built up using packages such as Eloquent, FastRoute, etc.). Alternatively, as a third option, we could take a multi-contributor approach. So, if anyone is interested, feel free to send me a DM and we can chat about it.