iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad Pro 2 (12.9-inch, WiFi), released on 2018-04-16T17:07:55Z. The update package is 198.9 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 48cd10f1d2062905a72cc8f0f848e8c036547d3e.zip.