Scala can be downloaded and installed on either a Windows or NIX platform (e.g. Linux, OS-X) here. For this lecture you must install Scala 3, and we recommend installing it using Coursier (see the previous link)

One of the most widely used IDE (Integrated Development Environment) for Scala is:

• IntellIJ
• alternatively, you can use Sublime, which is a simpler (faster) editor. You can add syntax highlighting plugins for Scala (see: scalameta ), as well as worksheet/REPL support (see: SublimeREPL).