HD wall patterns and accurate floor tiling.

Find where your game is installed (e.g., C:/Games/GarrysMod/garrysmod ). Open the Addons Folder: Go into the addons folder.

A popular site for the Garry's Mod community that mirrors Workshop content for manual download. "Five Nights at Freddy's 1 Map."

Move the extracted map folder (which should contain maps , materials , and models subfolders) into addons .

Makes the world outside the windows feel realistic. Top Sources for No Steam GMod Map Downloads

Use WinRAR or 7-Zip to open the download.

Flickering hallway lights and "Power Out" sequences.

While more focused on total conversions, ModDB hosts several GMod map packs that include the original Pizzeria. "FNAF Map Pack Garry's Mod." How to Install FNAF 1 Map Without Steam

Since you aren't using the Steam Workshop, you need reliable third-party repositories. These sites host .gma or .zip files that you can manually install. 1. GameBanana