Believe it or not
Before you risk your security, understand that NCH Software provides a Freemium model .
If the free version of MixPad doesn't meet your needs, these professional-grade DAWs (Digital Audio Workstations) are completely free to use: MixPad Multitrack Mixer - Apps on Google Play
NCH Software is known for its specific method of handling licenses. Unlike some companies that might just say "Invalid Code," NCH has been known to "trap" users who attempt to use pirated codes.