Here is the first version of the Portal 2005 Beta Portal Gun. I hope there will be more updates in the future. The Portal 1 version is coming soon.
INSTALLATION:
1. Open the archive
2. Go to your steam library and go to the "Tools" tab.
3. Search for Portal 2 Authorising Tools. Install it.
4. Open the "bin" folder (steam/steamapps/common/Portal 2/bin) and unzip the archive.
5. Copy the "pak01_dir" folder into "vpk.exe" then launch the game.
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i have no idea how to install this, because the instructions weren't very clear to me