allitems_1.20-1.20.1.zip is a release file of the Minecraft data pack The Ultimate Item Toolkit [1.13-26.3], made for Minecraft 1.20.1, 1.20, 1.20-Snapshot. It was published on June 26, 2026 and is 0 MB in size. For the full description, screenshots and every other version, visit the The Ultimate Item Toolkit [1.13-26.3] data pack page.
How to install: Put the .zip into the datapacks folder of your world (.minecraft/saves/<world>/datapacks) and run /reload. No mods needed.