You're going to need Winrar or something similar.
List of the downloads you'll need:
- The original Female Scout model: Gamebanana.com
- The panty fix skin: Gamebanana.com
- Sound pack (A temporary one, I'm working on making an edited version): Gamebanana.com
- Updated version (Adds shoes and socks bodygroup + some item fixes, needs the original model): Gamebanana.com
Download from all these links, then extract the original model, panty fix, and updated version to C:\Program Files\Steam\steamapps\YOUR USERNAME HERE\team fortress 2
If you are a Windows 7/8 or Windows Vista user, extract them to C:\Program Files (x86)\Steam\steamapps\YOUR USERNAME HERE\team fortress 2
Then extract the voice pack to C:\Program Files\Steam\steamapps\YOUR USERNAME HERE\team fortress 2\tf\sound or C:\Program Files (x86)\Steam\steamapps\YOUR USERNAME HERE\team fortress 2\tf\sound if you are a Windows 7/8 or Vista user.
That should do everything. Test the femscout out in-game just to make sure. Talk to me on Steam if you have any questions.