https://wccftech.com/how-to-download-ios-15-beta-2-without-developer-account/

iOS 15 and iPadOS 15 beta 2 is finally here and we will show you how you can download it without a paid developer account in a few easy steps.

Apple has released the second beta of iOS 15 and iPadOS 15 to registered developers, which basically means you need to pay up $99 on an annual basis in order to get access to this kind of software. But, if you wait until July, Apple will release the public betas for everyone to try out. It is just a matter of patience at this point.