[Exeter Cu Ion]

Hi. Can anyone tell me what key I have to press to install the game? I know 'I' is Input, 'O' is Output (this seems to freeze the install with a beige screen) 'S' is Sound and 'Q' is quit, but I can't seem to find the key (or key combination) to Install?

I'm using DosBox 0.74, with c: drive mounted as my usual dosbox folder, the Maelstrom download from this site, and a: drive mounted as the unzipped folder containing the install files.