Posting questions on ChiefTalk is a great way to get answers.
Complete download and registration instructions for Chief Architect are easy to access and understand.
The ability to export a 3D model for use in the new Chief Architect 3D Viewer mobile app has been added to the 18.3 build of Chief Architect X8, allowing you to share 3D models of your plans with colleagues and clients. To ensure that you are running the most current version of Chief Architect software, select Help> Download Program Updates from the program menu.
As the message implies, either the e-mail address, or password, that you are entering is incorrect. Verify spelling and case and if necessary reset your password.
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At this time, there are three different sections of the Chief Architect website you could potentially log in to; My Account, ChiefTalk, and the Support Center.
You can use the Online Support Center to contact Chief Architect's Technical Support team and send them your plan files for review.