I have calmly reported the problem with our site to our team.
The Autodesk Labs site is experiencing technical difficulties. Actually this is a hardware issue affecting all of the Autodesk Community Sites. A team of employees, partners, and vendors are working on the problem. I apologize for the inconvenience. I know many of you want to download the technology previews. Thank you for your patience and continued participation in the Autodesk Labs experience.
Troubleshooting is alive in the lab.