The rocket update is a release file of the Minecraft resource pack PWR and GVR Railways IR, made for Minecraft 1.12.2. It was published on June 12, 2022 and is 65.2 MB in size. For the full description, screenshots and every other version, visit the PWR and GVR Railways IR resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.