*The "Custom" preset in the free version is lost if you switch back to Auto or Full Blast.
The most secure way to get a legitimate license key is directly through the developer: Official Store buy a Pro license CrystalIDEA website License Delivery macs fan control license key link
The free version is sufficient for 90% of users. You only need Pro if you want complex, multi-sensor fan curves (e.g., “speed up if CPU or GPU gets hot”). *The "Custom" preset in the free version is