How to downgrade to an older version of DMXIS on OSX

If you try to downgrade to an older version of DMXIS on OS X, the installer fails with the error “newer version of this software already exists”. The solution is:

Open Terminal (in Applications/Utilities)
Type “sudo pkgutil –forget com.enttec.dmxis”
Enter your admin password when prompted
Type “sudo pkgutil –forget com.dbaudioware.dmxis”
Run the DMXIS installer again