NodeJS can be downloaded here: nodejs.org/en/download
Alternatively you can install NodeJS through your operating system packager manager.
An excellent way to manage your NodeJS installation and be able to work with multiple version is to go through NVM.
Install a package manager¶
Install a package manager for nodejs like pnpm, npm or yarn.
pnpm is recommended.
Instructions on how to install pnpm can be found here: pnpm.io/installation
Install package with pnpm¶
pnpm install @solar-network/client