https://wccftech.com/download-ios-15-5-and-ipados-15-5-beta-3-released/

Apple has released beta 3 of iOS 15.5 and iPadOS 15.5 software updates for iPhone and iPad alongside others.

If you have the second beta of iOS 15.5 and iPadOS 15.5 installed on your iPhone and iPad, then you can go right ahead and download the third betas immediately.