If you need professional features like VST support or unlimited tracks, NCH offers two main editions:

To use for free, you do not actually need a registration code. NCH Software offers a official Free Version of MixPad for non-commercial, personal use. Official Free Access

Cracked versions of MixPad frequently crash, lose save files, or suffer from audio glitches because the software's core code has been tampered with.

You can download it directly from the Official NCH Website .