Apple Released their new IPadOS 13 Beta 4 For developers with Multiple new features and Function for you to use and which will be added in the final version of IOS 13 In Late September 2019, you can download the IPadOS 13 Beta 4 offline if you are not able to download Through OTA.
Source Apple : This version is intended exclusively for software developers to test their apps and start adopting the new technologies in iPadOS. Make sure to back up your device and install only on systems you are prepared to erase if necessary.
- ReleasedJuly 17, 2019
Installation requires macOS 10.15 beta or Xcode 11 beta.
- iPad Pro (11 inch), iPad Pro (12.9-inch)(3rd generation) 17A5534f
- iPad Pro (10.5 inch), iPad Pro (12.9-inch)(2nd generation) 17A5534f
- iPad (5th generation), iPad (6th generation) 17A5534f
- iPad mini (5th generation), iPad Air (3rd generation) 17A5534f
- iPad mini 4, iPad Air 2 17A5534f
- iPad Pro (9.7‑inch) 17A5534f
- iPad Pro (12.9‑inch) 17A5534f