When you search for "top free keys" on third-party sites, you enter a dangerous territory of "cracks" and "keygens."
If you have previously purchased the software but lost your key, you can find it in your original order email by searching for "iBoysoft license" or by using a registry editor to find the keyCode on your PC. Risks of Using "Cracked" License Keys
On the seventh page, a tiny forum post: "Stop hunting for stolen keys. The free trial recovers 500MB. Clone what you can."