Install Node.js: https://nodejs.org/en/

Update NPM
> npm install npm@latest

For building css:
1. Copy _css_sources to temp location
2. Open cmd in copied _css_sources in temp location
3. Install project dependencies:
> npm install
4. In this temp location in scss folder leave only needed PMC for which you need to build css
5. Open cmd in _css_sources/scss/{pmc}
6. Build css:
> npm run build-css