The classic interface is distraction-free, making it a favorite for educators and beginners. How to Download Arduino 1.8.19
It is incredibly lightweight and runs smoothly on older PCs or laptops with limited RAM.
Plug your Arduino Uno (or other board) into your computer via USB.
Click the Upload button (the right-pointing arrow). If the onboard LED starts flashing, you are ready to build! Troubleshooting Common Issues
Unlike newer versions, 1.8.19 offers a "Portable" mode, allowing you to run the entire IDE and your libraries from a USB stick.
Version 1.8.19 comes bundled with Java, but if you have conflicts, try reinstalling the IDE or using the ZIP version.
Go to Tools > Board and select "Arduino Uno."