How to install NodeJS LTS on Windows as a local user (without admin rights)

UPDATE 10/2018

On Node's download page referenced in step 1. there is now a .zip archive download which contains both the nodejs executable and npm. Unpacking that to a suitable path and adding this path to your PATH environment variable (step 2.) will give you both node and npm (so you can skip steps 3. - 6.).

Let say you want to install it into %userprofile%\Applications\nodejs-lts, let's name it <NODE_PATH>.

1. Download the LTS node.exe binary for Windows and copy it to <NODE_PATH>.

2. Add <NODE_PATH> to your PATH environment variable (set PATH=<NODE_PATH>;%PATH% or using Windows user interface)

3. Download the stable at https://registry.npmjs.org/npm/-/npm-{VERSION}.tgz npm package (following the documentation)

4. Unzip the npm-{VERSION}.tgz anywhere (using 7zip for example)

5. Launch a cmd and cd into the place where you have unzipped npm

6. Execute: node cli.js install -gf or node bin/npm-cli.js install npm -gf on certain versions (thanks to this comment)

The last command is specified in the Makefile for target install, target which the README.md invites to execute when manually installing.

The nodejs version of 6.11 LTS and later seems to be easier to install, because npm is already included.

1. Download the node.js LTS binary for Windows and extract it to your desired location
2. Add the path of the nodejs folder to the PATH environment variable: (Shortcut winkey+R and enter: rundll32 sysdm.cpl,EditEnvironmentVariables)
3. Open a new command window (winkey+R and type cmd)
4. Type node -v and npm -v to verify the installation