GT_Decorationsv1.jar is a release file of the Minecraft mod GT Simple Decorations for Forge, made for Minecraft 1.12.2. It was published on February 12, 2023 and is 7.6 MB in size. For the full description, screenshots and every other version, visit the GT Simple Decorations mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.