You can purchase the license directly from the creator's official shop at gun4ir.com . The link to the product is frequently posted in community threads. After you buy it, the license file will be sent to your email.

The revenue generated from licenses is used entirely for GUN4IR-related expenses, such as continued development, hardware prototyping, and maintaining community resources.

, which is essential for flashing firmware onto microcontrollers (like the Arduino Pro Micro) and performing critical calibration. The system distinguishes itself through: Four-Point IR Tracking:

If you encounter an error stating your license is missing or invalid, first ensure you placed the license file in the same directory as the GUI software. If the issue persists, try re-downloading the file from the original link you were provided. For specific error codes, searching the official forum at the Arcade Controls forum or the Gun4IR Discord server is often the fastest way to find a solution from the community or the developer.

What (e.g., Pro Micro, Teensy) are you using?