So then you press "CONTINUE" and I assume you are taken to the Graphisoft ID login page?
I have never had the need to use BIMCloud (Basic or otherwise) so I may not be the best person to reply here.
This is what I see when I get to the Graphisoft ID login page.
If you don't have a Graphisoft ID then there is an option on the left to sign up.
But if this page is still not displaying correctly and you have tried different browsers, then I am out of ideas.
It may be best to contact your local Archicad support person.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11