Since iOS 16.4 and iPadOS 16.4, Apple has made notable changes to how Developer Beta and Public Beta updates are downloaded on iPhones and iPads.
Instead of using beta profile files that could be downloaded onto your device as before (the files that you downloaded from this website), you will now have to use an Apple ID that participated in the Apple Developer Program (for Developer betas) or the Apple Beta Software Program (for Public Betas).
As their name suggests, the Developer beta are intended for developers to test their apps before releasing them to the public. The Developer beta is usually released a few days earlier than the Public beta. However, the first Developer beta version is usually released immediately after the opening keynote of Apple's annual WWDC (in early June), while the first Public beta version is typically released about a month later (usually in July).
Because it is released earlier, many people prefer to install and use the Developer Beta. But, it also carries more risks than the Public Beta.
To continue using beta software on your device in the future, you should join one of the two programs mentioned above because Apple will no longer release beta profile files for iOS 17 and iPadOS 17 and later.
Scroll down to the bottom of this page to see the next steps if you are already a member of the Apple Beta Software Program or the Apple Developer Program.
Sign in with your Apple ID
To join the Apple Beta Software Program, please visit beta.apple.com. Tap on Sign up button, then log in with your Apple ID.
You can use a different Apple ID to join, it doesn't have to be the Apple ID you're signed in with on your device.

Agree to the Terms
Tap on Accept button to agree with the terms and conditions.

What's next?
After registering for the Apple Beta Software Program, you need to enable the "Beta Updates" option in the Settings app to receive the latest beta updates.
Learn how to enable iOS / iPadOS betas from the Settings app →Sign in with your Apple ID
Go to the Apple Developer Center (developer.apple.com/account) and sign in with your Apple ID. You don't need to join Apple's Developer Program, no payment is required, just sign in.

Agree to the Terms
Check the box for the terms and conditions and tap the Submit button.

What's next?
After logging into the Apple Developer Center, you need to enable the "Beta Updates" option in the Settings app to receive the latest beta updates.
Learn how to enable iOS / iPadOS betas from the Settings app →