By the way, should anyone look in here some time later and wonder about Brave... I got a little help in their forums today and was told that while the linked version above will install for my antique machine, and do some stuff (like what I needed!), it's not "supported" for anything earlier than Mac OS 10.15, as of 2024.
Meaning of course that not everything works the way it would if... my computer were newer. (Ay-yi!) And it won't get better.
It does what it needs to, at this moment. No complaints at all. Upwork's being a pain with infinite captchas, calling me inhuman repeatedly—but now, I can get past it.