iOS 15 is almost here but before the official release gets pushed to the public, you can get the ‘final’ beta named iOS 15 RC right now.
Usually, these types of betas are reserved for developers but there is a way you can get a hold of this software to install on your Apple device before it is released to the masses. Click the download button on this page and you’ll be taken to the Apple Beta Software Program in which you can sign up and get access to iOS 15 RC.
Before you do though, ensure your device is up to scratch for the install and maybe back up your files just in case
If you have previously installed an iOS 15 beta, the process is even simpler, just go to Settings > General > Software Update and you’ll be good to go.