You can always try the 'Contact' form on the site, it's not likely anyone here is going to be able to give you good advice
I know, as I've said, I've sent them an email through that form two days ago but have still gotten no response.
2 days ago was Friday, it's likely they don't work the weekends.
Could be so, though it doesn't look like a site where the devs have a fixed time schedule. (Not that I know much about managing a website, just my impression.)
Are you on a VPN? Sometimes that screws with CAPTCHA
Nope. I actually tried using a proxy and it got rejected for that very reason (with a different message), whereas two normal IPs had the problem described in OP.
Have you tried running Wireshark or something similar so you can see what's happening on the back-end?
No, I have no idea what that is and I suspect I won't be able to figure it out, but I can give it a try.
My suspicion was correct, I can't figure it out.
This wouldn't be a tool for wireshark. It could be a tool for the browser dev tools though. With it you can see every time a website tries to make a connection out, what data is submitted, and what the response is. Unfortunately, if you don't understand how http works, it might be all Greek.
...What?
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