While a full "free version" does not exist from official sources, you can find maintenance updates and documentation on the Roland DT-1 Support Page Mac OS X Updater
These pages often contain "Download" buttons that lead to unwanted software installations rather than the actual program [5]. dt1 vdrums tutor free download upd
The DT-1 software was built for older versions of Windows and Mac. If it fails to launch, try using "Compatibility Mode" (Windows) for Windows 7 or 8. While a full "free version" does not exist
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: Users can import their own Standard MIDI Files (SMF) to practice specific songs.