Trying to get back onto GOG Galaxy just so I can update Dead Cells, but it's on a new computer and I of course I don't know the password. After doing about 15 (not kidding) captchas to identify stairs and motorcycles, I am sent a password reset link. However, it only links to an error 404 page. I have done this twice, with the same results.

Any ideas?

Why don't you know the password to your own GOG account?
Why do you need GOG Galaxy just to update one game? Aren't incremental patches available for it?

I've used the password reset link in the past with no issue. Try using it in a fresh browser with no add-ons or custom settings. If all else fails, try e-mailing support (at) gog (dot) com

Heck, at this point, even without incremental patches, Dead Cells is a small game. I'd have downloaded the offline files and installed it again before fighting with Captchas that much...

That's odd, I could just yesterday reset my password. I did it on an android phone using Nightly Firefox browser if that helps.