Download Beta Profiles for iOS, iPhone, iPad, iPod and Apple Tv
Download tvOS 15 Beta Profile:
1 Open Settings app
For Installing tvOS 15 Beta Profile Open the Settings app and move to General – Privacy – Send Apple TV Analytics.
2 Do some trick
Now you can download tvOS 15 Beta Profile . When you have Share Apple TV Analytics selected, don’t click on it. Instead, press the Play/Pause button on the remote and it will open the Add Profile menu, press Play/Pause button again on this option.
3 Install profile
4 Reboot your Apple TV
5 Turn off Get Beta Updates
Make sure Settings – System – Software Updates – Get Beta Updates set to OFF.