Depending on what you are looking for, "ICY" refers to two very different programs.
If you are a developer or scientist, is an open-source biological image analysis platform. ICY PC Free Download
Run the file and follow the setup wizard (agree to terms, choose a folder). Launch the game from your Start Menu or desktop icon. Depending on what you are looking for, "ICY"
A newer indie speedrunning game where you control an ice cube, available on Softonic . ICY PC Free Download
For older versions like 1.3 or 1.4, community sites like Acid-Play host the original executable files. Installation Steps: Download the .exe installer.
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.