There is no legitimate "universal key" for ScreenPresso Pro.
If you have ever tried to record a 15-minute software tutorial or needed a clean video without a logo, you immediately understand why the free version feels "not quite better enough." If you type "screenpresso activation key free better" into Google or YouTube, you will find dozens of sketchy links promising a text file with a serial number or a keygen.
Perhaps the user doesn't actually want a cracked key. Perhaps they want to know: