Geckolib-forge-1.19-3.1.39.jar -

Ensure you have the correct version of Minecraft Forge installed for 1.19.2.

geckolib-quilt-1.19-3.1.39.jar - Minecraft Mods - CurseForge geckolib-forge-1.19-3.1.39.jar

Place the .jar file into your Minecraft mods folder. Ensure you have the correct version of Minecraft