APPLE INSIDER
Apple has moved on to the fourth round of developer betas for its milestone operating systems, with new builds of iOS 14, and iPadOS 14 available to download for testing.
The newest builds can be downloaded via the Apple Developer Center for those enrolled into the test program, or via an over-the-air update on devices running the beta software. Public betas typically arrive within a few days of the developer versions, via the Apple Beta Software Program website with the most recent released on July 23.This fourth round follows after the third, which shipped on July 22. The second round of betas landed on July 7, while the first appeared shortly after the WWDC debut on June 22.
Source: APPLE INSIDER