3.5 is a release file of the Minecraft resource pack BlueBlocksCraft Vanilla, made for Minecraft 1.12.1, 1.12, 1.12.2, 1.12-Snapshot. It was published on June 20, 2020 and is 20.4 MB in size. For the full description, screenshots and every other version, visit the BlueBlocksCraft Vanilla resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.