People in China (Mainland) can't use CAPTCHA.

[heipiao233]

Because it's a Google service. I can only tell you here.
And we can't see ADs in the download page, then we can't download.

[TheCurle]

What did you click to get that Security Check message? I'm not aware of anything on any of our pages that requires that.

Additionally, download links all have a direct version for situations like this.

[heipiao233]

We can't load the CAPTCHA. The dialog doesn't appear.

[TheCurle]

Which CAPTCHA? Where? What page?

As far as I can tell, we don't even have one. I need a link to the page you're on.

[heipiao233]

Everywhere. Are you in China? If yes, close your VPN and try to click Sign Up. There is a security check.

[TheCurle]

Okay, after roaming about our web pages for half an hour with no feedback from the user, i've determined that they're talking about the Forums;

This is something we should fix, hmm

[PaintNinja]

Switching to hCaptcha could work, it claims to work in all countries and does not rely on Google at all.
https://www.hcaptcha.com
https://docs.hcaptcha.com/switch/

[IzzelAliz]

You can switch to recaptcha.net which is accessible in China.
https://developers.google.com/recaptcha/docs/faq#can-i-use-recaptcha-globally

[PaintNinja]

You can switch to recaptcha.net which is accessible in China.

https://developers.google.com/recaptcha/docs/faq#can-i-use-recaptcha-globally

A quick search yields mixed results. Some claim the same as you, others claim it doesn't work as you're still technically accessing a Google service which is banned in China. E.g. https://stackoverflow.com/questions/53119009/recaptcha-issue-in-china/53758862#53758862

Imo, switching to hCaptcha would be a more reliable solution and provide a small additional revenue stream to Forge in the process.

[heipiao233]

https://microsoftedge.microsoft.com/addons/detail/%E5%9C%A8%E4%B8%AD%E5%9B%BD%E5%A4%A7%E9%99%86%E4%B8%8D%E7%BF%BB%E5%A2%99%E4%BD%BF%E7%94%A8recaptcha/igiopnakllabkjodblocknclmdbhbkdd