Chief Architect has a program update available to resolve the activation issue introduced in Mac OS Sequoia (Mac OS version 15). This patch applies to Chief Architect X16 and Home Designer 2025 products.
Prior to installing this update, you will first need to deactivate your software. After the patch is installed, the software will activate on your computer and resolve the activation issue caused by changing Wi-Fi networks.
Please note that after the patch is installed, X16 and Home Designer 2025 will be using different identifiers than prior versions so if you switch between this version and an earlier version (like X15 or Home Designer 2024) you will need to deactivate.
Patch Installation Instructions:
Sign in to your Chief Architect Account: https://accounts.chiefarchitect.com/digital-locker
Click on the "MAKE AVAILABLE" button under your product key.
Click the "DOWNLOAD" link. Choose "Mac" then download and install the patch.
If you have any questions about the process please contact our Technical Support team.
We've seen a few of these in the last week and it appears to be an out of date security certificate.
We have a patch in the works but if you need it now you can go to this site: https://www.amazontrust.com/repository/
Under the heading "Root CAs" click the DER from the first link under "Self Signed Certificate"
Download, save and install the certificate.
Close and reopen Chief and try the download again. If you continue to have trouble after that please reach out to Technical Support so we can look closer at what you are experiencing.
CarrieS's post in Online Authentication error was marked as the answer