iOS 9 beta 2
Updating iOS 9 public beta to iOS 9 beta 4 without developer account   (phonerebel) phonerebel

Avid iOS users can now directly update the first public beta for iOS 9 to its latest developer version (beta 4) and enjoy all the latest performance optimisations and feature enhancements over the previous builds.

Folks at iDownloadBlog have shared a simple guide to accomplish this task with ease:

Step 1: Launch Settings app and select General > Profile

Step 2: Tap on the iOS 9 Beta Software Profile

Step 3: Tap Delete Profile > select Delete

Step 4: Reboot your device

Step 5: Go to Settings > General and hit Software Update to check for the latest iOS 9 developer beta

Step 6: Tap Download and Install to begin the iOS 9 beta 4 installation

This procedure allows non-developers to legitimately upgrade their software to the latest iOS 9 developer beta iteration. It has been confirmed that the latest beta software is fully functional and without any issues.

[Source: iDownloadBlog]