Pianotrone Virtual Grand Piano 4.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the program is Syntheway. We recommend checking the downloaded files with any free antivirus.
From the developer:
Pianotrone is a grand piano emulation based on the Bösendorfer 170, Kawai 600, Steinway Model C, Yamaha C5 and C7 acoustic grand pianos models.
You may want to check out more software, such as Virtual MIDI Piano Keyboard, Pianissimo or Virtual Notifier, which might be related to Pianotrone Virtual Grand Piano.