NifSkope does not use a traditional installer. It is a "portable" application. NifSkope - Miscellaneous / Other - Nexus Mods Forums
The standard NifSkope 2.0.dev7 or later is highly recommended for stability and features like shader previews. how to download nifskope
NifSkope versions are often specific to the game you are modding. NifSkope does not use a traditional installer
How to Download NifSkope: A Complete Installation and Setup Guide if your PC is older
Download the .7z or .zip archive (e.g., NifSkope_2_0_2018-02-22-x64.7z ). Note that some modern versions may require CPUs with support; if your PC is older, look for the noavx2 version. Step 3: Install and Setup
For modern games like Fallout 76 or Starfield , the most up-to-date versions are maintained by community forks like fo76utils or UnknownExplorer13 .