Avoid buying keys from eBay or G2A. These are often stolen credit card purchases or "volume license" keys that will be revoked within 30 days.
Cracked versions of software are modified binaries. This means the original code has been altered to bypass the license check. This alteration can lead to software crashes, corrupted downloads, and incompatibility with Windows or Mac OS updates. YTD Video Download License Key
It is incredibly tempting to paste one of these codes into the software to save $20–$30. Avoid buying keys from eBay or G2A
The Pro version removes all in-app advertisements. YTD Video Download License Key