This is the final stable version of the 1.x series and is officially maintained for critical security fixes. You can download it directly from the Official Arduino Software Page by scrolling down to the "Legacy IDE" section.
The official Arduino website continues to host previous releases for users who need a stable, well-tested environment. download old version of arduino ide
For even older releases (dating back to version 0.1), Arduino provides a dedicated Old Software Releases page. This is the final stable version of the 1
While the latest Arduino IDE 2.x offers modern features like autocomplete and integrated debugging, many developers still prefer to for its lightweight performance, "Portable Mode," or compatibility with legacy libraries and older hardware like the Arduino Pro-Mini . Where to Download Legacy Arduino IDE Versions For even older releases (dating back to version 0
If you need a specific earlier version of the modern 2.x IDE (like 2.1.1), you can find them under the "Assets" section of the Arduino IDE GitHub Releases. Why Developers Choose Older Versions Download old verison of Arduino 2.x