Install the Mod

Locate your Minecraft installation folder and open:

mods

Place the downloaded TRP .jar file inside this folder.

For Minecraft 1.20.1, also place the required Theatrical .jar in the same folder.

Your installation should look approximately like this:

minecraft/
└── mods/
├── theatrical-realistic-pack.jar
└── theatrical.jar (Minecraft 1.20.1 only)

The exact filenames may vary depending on the version downloaded.