HD installer is contained on disk 1.
Based on 1991 Disney PC/Tandy releasePC versions: CGA-EGA-MCGA/VGA-TandyN.B. Atari ST/Spectrum versions were unreleased despite mag previews. The ST version, though, surfaced in 2017.
[1] Licensed game based on Hollywood Pictures/Disney's 1990 horror comedy film "Arachnophobia".[2] Game published/distributed by Titus in Europe, distributed by Questor in Australia, and by LEADER in Italy.