Installing the iOS 15 Beta or iPadOS 15 Beta without a developer account is not recommended and may not be possible. Apple's beta software is intended for developers to test and provide feedback on, and installing it without a developer account may cause issues with your device.
If you want to try out the new features of iOS 15 or iPadOS 15, you can sign up for the Apple Beta Software Program, which is open to the public and allows you to install and test the beta software on your device. To join the program, follow these steps:
Go to the Apple Beta Software Program website (https://beta.apple.com/) and sign in with your Apple ID.
Agree to the terms and conditions of the program.
Go to the "Enroll Your Devices" section and follow the prompts to enroll your device in the program.
On your device, go to "Settings" > "Software Update" and follow the prompts to download and install the iOS 15 Beta or iPadOS 15 Beta.
Note that beta software is usually less stable than the final release version, and may contain bugs and other issues. It is not recommended to install beta software on your primary device, as it may cause data loss or other issues
