paulsalter said:

You can now join the program

https://insider.windows.com/

Not done it myself yet, but got as far as the agreement page for it

Welcome to the Windows Insider Program, Now that you're a Windows Insider, you'll be among the first to discover the new features and capabilities of Windows Technical Preview. We’re thankful for your willingness to give feedback on these early builds of Windows. Together, we’re building the future of Windows. Let’s get started. Be sure to set up your PC If you haven’t already, make sure you install Tech Preview. (If you're an IT pro testing Windows for your organization, download Windows Technical Preview for Enterprise.) This is an early preview. See Before you install to ensure downloading it is right for you and your PC. Once you're set up Here’s how to share your feedback and stay up-to-date as an Insider: Use your registered PC to experience Tech Preview. Send us feedback and report problems through the Windows Feedback app. Visit the Windows Technical Preview forum to ask questions, get answers, and talk with other Insiders. (IT pros: Visit the TechNet forums.) Get the latest preview builds by keeping your PC plugged in and turned on.

From time to time as new features are released, we will contact you via email to keep you in the loop on the latest. Be sure the Windows Insider Program is on your trusted sender list. You can also read the announcements in the forums. Thanks again. Together we will make this Windows the best Windows ever! The Windows Team

Same here, I have joined program but it says cant find page for download link

I got the info for this page being ready from the official MS forums, it did mention things starting at 5pm UK time (50 mins from now)
so looks like you can join the program now and hopefully get the download within the hour

this is the topic I found

Supposed to go live at 9am Redmond time...