To download and set up (Legacy) on Windows, it is essential to distinguish between the software's actual version numbers and the versioning used by the Microsoft Store .
For the most stable and secure experience, it is highly recommended to download the official software directly from Arduino.cc Arduino IDE 2.3.8 (Latest): Download Arduino IDE 1.8.57 for Windows
Yes, 1.8.57 works flawlessly on Windows 11 in compatibility mode, though it is not "officially" listed. You may need to allow the USB driver through Windows Defender. Arduino IDE 1
In Tools → Board → Board Manager, ensure you are using the latest "Arduino AVR Boards" package (1.8.6 or higher). Alternatively, use an older version of the library (Library Manager → Select version → Install). Yes, 1