Custom Folder

1. Download the custom folder from Here

2. Go to desired game folder (i.e. steamapps/common/Half-Life 2/hl2) and make a folder named "custom" if there isn't one already

3. Drag folders from the custom folder inside the zip to the custom folder inside your game, structure should look similar to below:

steamapps/common/Half-Life 2/hl2/custom
├───Folder1
├───Folder2
│ ...

It is recommended to get the menuoptions folder from the zip file.

5. Verify it works