Knockdown Duration Nerf

Reduces heavy knockdown duration to a maximum of 3 seconds, so you can't execute knocked down enemies one right after the other.

Install:

Same as installing most other TW3 Mods. Avoid Vortex, TW3 Mod Manager recommended  if you need a manager. Place any \modxxx folders directly inside your <TW3 game install>\Mods (or \mods) folder, place any \dlcxxx folders directly inside your <TW3 game install>\dlc (or \DLC) folder. Merge everything with Script Merger.

How to install most simple TW3 Mods for newbies/klutzes:

First you gotta locate your The Witcher 3 game install location. Usually it's somewhere like "C:\GOG Games\The Witcher 3 Wild Hunt GOTY" for Good Old Games versions of the game or "C:\Program Files (x86)\Steam\steamapps\common\The Witcher 3" for Steam versions of the game.

Script Merger

Download, run/install it, run what it installed to be sure it's working.

Script Merger Unofficial Patch:

Download, run/install it, run what it installed to be sure it's working.

Optional but highly recommended:

TW3 Mod Manager

Download, run/install it, run what it installed to be sure it's working. Installing it all to some place like C:\TW3Modding\ should work.

Mod Limit Fix

Download, run/install it, run what it installed to be sure it's working

Enable the Debug Console: https://www.nexusmods.com/witcher3/mods/3375. Press the keys on your keyboard until you figure out which one activates the console.

After that you can install most mods by downloading them manually (VORTEX NOT RECOMMENDED WITH TW3 MODS, IT WILL EVENTUALLY CAUSE PROBLEMS). Extract their contents somewhere (rightclick on the downloaded mod file->extract) and then place their files&folders in the right places in your game install yourself OR let TW3 Mod Manager extract and place them correctly for you (Recommended).

If you're not using TW3 Mod Manager you need to make sure all of your mod's \modxxx folders end up directly inside your <TW3 game install>\Mods folder (or <TW3 game install>\mods, wherever your other mods are). If there's no mods folder in your TW3 game install folder (TW3MM would've created one for you) you can create one by rightclicking on some empty space there -> "New" -> "Folder" and write Mods as its name. That means your \modxxx folders ends up as <TW3 game install>\Mods\modxxx. TW3MM would place it there automatically for you so you wouldn't have to.

If your mod has \dlcxxx folders they similarly need to be directly inside your <TW3 game install>\dlc folder (or <TW3 game install>\DLC wherever your other dlcs are). They should end up as <TW3 game install>\dlc\dlcxxx ( never <TW3 game install>