Yeah, I've hit it too. very, very annoying. I use a download manager to avoid downloading more than one file at a time (I like queuing it up). And it's worked fine in firefox/win10 for weeks now, but suddenly it started on every download. i tried logging out and logging back in but it still does it.
I tried it in chrome, where recaptcha doesnt seem to be required, but I don't use chrome out of privacy concerns. And guess what. Recaptcha is from google. They're a scum ad-tech surveillance company.
I know SLR probably don't care, or don't know about alternative captcha systems, but I would love it if you could move away from recaptcha.