When clicking the green flag, After the sound plays, press 1 to start the installer. When it is finished and it "restarts" the "computer" press 2 to boot from the Hard Drive (HD) instead of restarting the installer.
Updates: 9/12/2024: I started the "os" 9/13/2024: I added another wallpaper (it chooses a random wallpaper when you start it) 3/8/2025: I added a new "os"