Install scala-cli from here: https://scala-cli.virtuslab.org/install

Download one of these files, depending on which language you want:

• English: https://github.com/litan/kojo-lib/releases/download/v0.2.0/kojo-english.scala
• Swedish: https://github.com/litan/kojo-lib/releases/download/v0.2.0/kojo-swedish.scala

Start the Scala 3 REPL with this command in the terminal in the same dir as the above file:

scala-cli repl .

You should eventually see something similar to:

Welcome to Scala 3.1.2 (17.0.2, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
         
scala> 

Test Kojo with this command inside the REPL after the scala> prompt:

forward()

You should now see the Kojo turtle in a new window drawing a red line.