Older, free versions were previously hosted on GitHub, but many have been removed or moved to mirrors like Gitee .
Alex first identified their setup:
There are two primary ways to access PID Toolbox depending on whether you want the latest pro features or a legacy free version: How to Install PID Toolbox for FPV Drones (outdated)
Here’s a helpful, concise story to guide someone through downloading and using a PID toolbox — whether for MATLAB, Python, or an educational tool.