Here is how 🙂

  1. Download a great demo from RedRum-Demos
  2. Unzip it and put the file in your tf folder, which you can find through program files – steam/steamapps/your account/tf2/tf
  3. Open your game
  4. Open the developers’ console by pressing the ~ key (tilde) – this has to be enabled in your options
  5. Write “playdemo” and you will notice that the name of the demos you downloaded will now appear below
  6. Either type in the name of your demo or hit the down arrow key and select the demo that you would like to watch

You are now watching the demo that you have downloaded! You will be able to learn from the 1337est players this way, and your game will undoubtedly improve.

Here are a few other tips:

  • Press “Shift” + “f2” if you would like to pause your game or rewind/fast-forward
  • When you are downloading a demo, make sure to read who has the POV (point of view) if you are looking to be able to switch throughout the characters

Thanks to:
GotFrag Forums