If you need the "Master's Edition" features (for commercial use or advanced effects), NCH provides a 14-day free trial This allows you to test the full suite of tools legally.
Searching for a for free from third-party sites is generally discouraged as it can lead to security risks or non-functional software. Instead, you can use the official free version of DeskFX provided by NCH Software for personal, non-commercial use. Official Ways to Use DeskFX for Free
: Most modern NCH software validates codes against their servers; unauthorized codes will eventually be blacklisted and disable the program.