I've done something like this before, but due to computer problems, i lost it ;^; So...with this one, i decided to share it~! :D
First step: Download this.
Second step: Put the folder pak01dir at: C:\Program Files (x86)\Steam\steamapps\common\Portal 2\bin or C:\Program Files\Steam\steamapps\common\Portal 2\bin
Third step: Drag down the folder to vpk.exe
Last step: It should create a vpk, look for it and rename it to pak01_dir.
Funny enough, VALVe actually left a beta catwalk model in the game files. I bet you used that for reference? Good job nonetheless :)
How do you actually add it
I need help installing the Portal 2 Beta addons
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