Hi Adam,
Thank you for your question and I am very sorry about the issue!
The initial intention was, the language version is offered based on your IP address, or you can change it with the Choose Region button. Unfortunately, due to a bug with the new website, the Choose Region button does not work properly at the moment. We have reported this issue already.
The USA version can be downloaded here:
For Windows:
https://graphisoft.com/dl/AC/24/USA/ARCHICAD-24-USA-3008-1.6.exe
For macOS:
https://graphisoft.com/dl/AC/24/USA/ARCHICAD-24-USA-3008-1.6.dmg
Thank you for your understanding! I hope that this issue will be fixed soon!
Have a great day!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT