There is only safe source for the MadMapper 5 download: The official GarageCube website.
A search for "Madmapper 5 download" often leads to piracy sites offering "cracked" versions. We strongly advise against this for three reasons:
Select the build tailored to your specific Operating System (macOS or Windows) to begin downloading the installer. The Free Demo Version
Before you even plug in a projector, run the Auto-Calibration tool under Tools > Projector Calibration . This will analyze your test pattern and suggest warp values.
MadMapper is professional-grade software. While you can download a demo version, it will have limitations (such as watermarks). A license purchase is required for professional use.