LEGO® Account Integration went live on September 18th, 2025, and today we released the v.2.25.9 Studio update.
Please update to v.2.25.9 to continue using Studio features that require login. You will still be able to access Studio, just without the ability to use features that require you to be signed in.
You can learn more about account integration and the updates coming to BrickLink® on the Help Page: https://www.bricklink.com/help.asp?helpID=2670.