Depending on what you are looking for, "ICY" refers to two very different programs.
Visit the Icy Bio-Imaging website to get the latest version for Windows, macOS, or Linux. Setup Guide: ICY PC Free Download
The game was officially re-released on Steam as a free-to-play title. This is the safest way to ensure compatibility with Windows 10/11. Depending on what you are looking for, "ICY"
A newer indie speedrunning game where you control an ice cube, available on Softonic . available on Softonic .