LivingRoom Upright Piano - Free Edition

I tried it. Could not tell when the installation was finished. Then could not locate the instrument to play it.

I'd recommend using an industry standard installer instead of your custom installer.

Hello. Sorry for the inconvenience. As the video in the dmg installer states, the installer is finished when the automator icon in the top-right stops spinning. Then there is also a notification in the notification center on your desktop and on your screen. Alternatively you can also open the manual install folder and drag the 2 folder's contents to the location in your user folder that is stated in the folder's names. The video explains it.

We may add a different normal installer in the near future, but they generally produce non-consistent results in different macOS versions, so until we can verify enough successes with those, we have to stick to this Automator installer.