https://wccftech.com/download-apple-finally-releases-ios-15-5-ipados-15-5-macos-12-4-and-watchos-8-6-rc-builds/

Today, Apple has seen fit to release the Release Candidate builds of iOS 15.5, iPadOS 15.5, macOS Monterey 12.4, and watchOS 8.6 to developers. The latest RC builds of the aforementioned firmware arrive a few weeks ahead of Apple's iOS 16 unveiling in June. Possibly, iOS 15.5 will be the last build before Apple unveils iOS 16 at its WWDC event next month. Scroll down to read more details on the subject and how you can download the RC builds of iOS 15.5, iPadOS 15.5, macOS Monterey 12.4, and watchOS 8.6 on your compatible devices.

As mentioned earlier, iOS 15.5 and iPadOS 15.5 RC builds are finally available for download on compatible iPhone and iPad models. If you are a developer, you can download the latest RC build on your iPhone and iPad through the Apple Developer Center or over the air. Make sure that you have installed the appropriate configuration profile from the Developer Center. iOS 15.5 brings minor additions to the mix of features other than performance enhancements and bug fixes. Check out Apple's official release notes for the build below.