If you're looking to activate CursorFX 4.03 or a similar version with an "exclusive" product key:
A rumor persists that Stardock issued a handful of lifetime exclusive keys to beta testers of version 403. These keys were not locked to a specific machine. To date, no verified copy of such a key has ever been published online. Searching for it is largely a goose chase. cursorfx 403 product key exclusive
Stardock officially discontinued CursorFX several years ago. The last version (2.x / 403 era) does not fully support modern Windows 10/11 features like: If you're looking to activate CursorFX 4
Trying to force old software to run can lead to cursor flickering, broken animations, or system instability. Stardock officially discontinued CursorFX several years ago