Skip the sketchy .rar links. Grab the official free version first to see if your system likes it, then head to WinCustomize to find the actually "interesting" designs.
Many sites offering .rar downloads for paid software bundle them with "extras" you don't want, like adware, browser hijackers, or worse. Since CursorFX integrates deeply with your system UI, a malicious version can cause stability issues or "blue screens."
Stardock offers a free version of CursorFX directly on their site. While it lacks some premium features like "Special Effects" or "Trails," it is safe, stable, and includes plenty of high-quality skins. Better Alternatives