Download and install AVR Studio 4.18 (build 684) first.
Hope this helps someone else hunting for this old but useful IDE. avr studio 4.18 free download
: Unlike newer versions like Microchip Studio, version 4.18 has very low system requirements and runs quickly on older Windows environments . Download and install AVR Studio 4
: A unified platform for writing, compiling, and debugging code for 8-bit AVR microcontrollers. avr studio 4.18 free download