If you are using Windows with very old NodeJS, then uninstall previous NodeJs and NVM (Node Version Manager) in Control Panel (Win7) or Settings/Apps (Win10) if exists. Make sure that they are removed from the PATH.
Reinstall NodeJS: https://nodejs.org/en/download It will install NPM as well.
Install TypeScript globally:
npm install -g typescript
Verify installation:
tsc -v
