For older versions like 1.8.9, the most common way to get keystrokes is through clients like or Lunar . These come with the mod pre-installed and optimized for performance. Badlion Client :
Download and launch the client for your version (e.g., 1.8.9). Once in-game, press to open the Mod Menu. Search for "Keystrokes" and toggle it on. How To Get KeyStrokes In Minecraft In Version 1...
: Get the version corresponding to your game (e.g., Forge 1.8.9) and install it as a client. For older versions like 1
Controls how quickly the key highlight disappears after you release it. Add or remove keys like the Spacebar, Sneak, or Arrow keys. Keystrokes v5 :: Custom Keybinds, Sneak + MORE! For older versions like 1.8.9