Folder Colorizer 2 by Softorino does not officially distribute "free" permanent license keys. To make the software work beyond the initial trial limits, you must use one of the official activation methods provided by the developer. Official Activation Options
Uninstall the current version. Download the official installer from the same website where you bought the license. Reinstall and activate.
Most websites claiming to offer "working" license keys for Folder Colorizer 2 provide high risks rather than high rewards.
Before diving into the troubleshooting, it is important to understand how the licensing for this specific software operates.
: Another free option for customizing folder hues.