https://wccftech.com/download-ios-15-beta-4-without-a-developer-account-right-now/

Want to download iOS 15 or iPadOS 15 beta 4 without a developer account? Here's how you can do it right now.

Apple released the fourth beta of iOS 15 and iPadOS 15 for compatible devices a few minutes ago and you can already download it if you do not have an Apple Developer Program subscription with you.