Avr Studio 4.18 Free ((free)) — Download

AVR Studio 4.19 is easier to find and usually works for most 4.18 projects. Try that first if your setup allows.

AVR Studio 4.18 was released as a base build followed by several Service Packs (SPs). avr studio 4.18 free download

: A unified platform for writing, compiling, and debugging code for 8-bit AVR microcontrollers. AVR Studio 4