If your goal is simply to get better audio on your PC without spending money, you don't need to risk your computer's security. There are phenomenal, completely free, open-source audio enhancers that actually outperform DeskFX in many ways:
Downloading a "cracked" version of DeskFX or a keygen from a torrent site or a bizarre URL might seem like a clever workaround, but it carries significant risks: deskfx registration code free
Some older versions of NCH software were offered free for non-commercial home use. However, as of recent versions, DeskFX generally requires a paid license key for continued use after the trial. Always check the current licensing terms on the official NCH Software website. If your goal is simply to get better