Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime

This error message means that Node Sass does not currently support your operating system and runtime environment. Node Sass is a library that provides binding for Node.js to LibSass, which is written in C++. It is used to compile Sass (Syntactically Awesome Style Sheets) into CSS.

To resolve this issue, you have a few options:

1. Upgrade Node.js: Make sure you are using the latest version of Node.js, as Node Sass may have added support for your environment in a newer release. You can download the latest version from the official Node.js website.

2. Use a different Sass compiler: If upgrading Node.js is not an option for you, consider using a different Sass compiler. One popular alternative is Dart Sass, which is written in Dart and has broader platform support. You can install Dart Sass globally using npm by running the following command:

   npm install -g sass

After installing Dart Sass, you can compile your Sass files by running the `sass` command followed by the source file and the destination file:

   sass input.scss output.css

3. Use a virtual machine or container: If neither upgrading Node.js nor using a different Sass compiler is feasible, you can set up a virtual machine or container with a supported operating system and runtime environment for your Sass compilation needs. This approach allows you to isolate your development environment while still using the tools you need.

Remember to check the official documentation and community forums for the specific libraries and tools you are using, as there may be additional solutions or workarounds available.