Following the yearly tradition, Apple made the first iteration if iOS 10 Beta available for developers. Even so, they are not so inflexible, so it is possible to install iOS 10 Beta without a developer account.
This way, any of us that wants access to all the latest features and improvements implemented into iOS can easily get it.
To install iOS 10 Beta without a developer account you will need to also set up a verified Apple Configuration Profile which will ensure your device can receive an OTA update to the beta firmware.
Considering you’re about to install a beta build, it’s best to backup your data to iTunes or iCloud before doing so. Should you experience any problems this would allow you to restore your data.
Also, your device needs to be compatible with iOS 10, and you can verify it here.
Install iOS 10 Beta without a developer account
Open Safari on your device and access this link: http://www40.zippyshare.com/v/NhFcgsbn/file.html
Tap on the Download Now button. This might seem obvious but I will mention this just to make sure. The profile needs to be downloaded directly on the iOS device you want to upgrade.
As soon as the download completes you will be prompted to install the configuration profile so go ahead and tap on the Install button. After the installation is complete, your device will automatically restart.
Once the system finishes rebooting, open the Settings app and go to General -> Software Update. The iOS 10 Developer Beta OTA update should be available at this moment.
All that’s left to do is to tap on Download and Install, and you will soon be able to enjoy iOS 10 on your device.